Receiving SLA and Dock-to-Stock: What 24 Hours Actually Means

By Bernardo Campelo, Forbes Business Council E-Commerce Leader, Amazon SPN Certified provider, Amazon SP-API authorized partner, and Founder of PrepVia.

A buyer at a fifty store retail chain sent me a vendor scorecard last month with fourteen rows on it. Row six read, "Dock-to-stock time, in hours." Not "turnaround." Not "prep speed." A specific number, due in the reply column by Friday.

I have watched this question move from big-box retail into the Amazon seller world through most of 2026. Enterprise sellers and the wholesalers who supply them grew up under retail vendor compliance, and they now point that same discipline at their prep centers. The old question was how fast is your prep. The new question is what is your dock-to-stock time, and it is a different question entirely.

Here is the problem in one sentence. A single shipment does not carry one clock, it carries four, and most vendors quote one of the four without ever naming which one.

The Question Big Buyers Are Asking in 2026

Vendor scorecards are not new. Big retail chains have graded suppliers on fill rate, on-time delivery, and chargebacks for decades. What changed in 2026 is who else adopted the habit. Amazon aggregators, private label brands selling seven and eight figures, and the wholesalers who feed them started building the same scorecards for their prep centers and 3PLs.

Search a competitor pricing page and you will find fast turnaround everywhere. You will rarely find dock-to-stock time defined in plain language, because it is a warehousing term borrowed from retail distribution centers, not a term prep centers grew up using. Buyers who came from procurement or supply chain roles brought the term with them, and they expect an answer in hours, not an adjective.

This matters because fast and dock-to-stock answer different questions. Fast is a feeling. Dock-to-stock is an audit trail with a start time and an end time, both provable.

Four Clocks, One Shipment

Every inbound shipment to a prep center passes through four distinct moments. Each one has its own owner, its own evidence, and its own reason to matter to you. Confuse them and you will compare a vendor fastest clock against another vendor slowest one, and call it an apples-to-apples decision.

Clock One: Truck at the Dock

This is the moment a trailer backs into the bay or a driver hands over a bill of lading. It proves arrival. It proves nothing about what happens after the doors open. A truck can sit at a dock for hours before anyone touches a box inside it, and a vendor who quotes from this clock is quoting the easiest number to hit.

Clock Two: Dock-to-Stock

Dock-to-stock is the span from that same threshold crossing to the moment your units are counted, verified against the packing list, and entered into a system as on-hand inventory. This is the clock the buyer on the scorecard actually wants. It answers a concrete question: how long after my truck shows up can I trust the count.

Clock Three: Prep Complete

Prep complete is the moment labeling, poly bagging, bundling, and boxing finish, and the units sit staged and ready to ship. This is what most prep centers mean when they advertise a turnaround number, and it starts only after Clock Two ends. A center can be honest about a fast prep clock while dock-to-stock quietly runs long in front of it.

Clock Four: Departure for Amazon

Departure is the moment the shipment physically leaves for the fulfillment center, whether by parcel, LTL, or partnered carrier. Some vendors extend the clock further, to the moment Amazon marks the shipment received, which folds in transit time and Amazon own check-in process, neither of which the prep center controls.

Why the Buyer on the Scorecard Cares About Clock Two Specifically

A wholesaler with inventory across multiple channels cannot plan a replenishment order on inventory it cannot see. Dock-to-stock is the moment inventory stops being a truck somewhere on the highway and becomes a number a planner can act on. Every day added to that clock is a day the buyer own forecasting runs on stale data.

For an aggregator managing dozens of ASINs across several brands, dock-to-stock drives cash conversion. Inventory sitting received but uncounted is inventory the finance team cannot report, reorder against, or release against a purchase order milestone. A slow prep clock costs you a few days on one shipment. A slow dock-to-stock clock compounds across every shipment you run through that facility, all year.

This is also why the scorecard question rarely mentions prep at all. The buyer already assumes prep happens. What the buyer cannot assume is that the count is accurate the moment it is promised.

How to Measure Dock-to-Stock From Your Side

You do not need your 3PL internal dashboard to measure this clock. You need two timestamps, and you can get both from documents you are already entitled to.

The first timestamp is arrival: the time on the signed bill of lading, or the confirmed check-in window if the carrier logs on-time delivery. The second timestamp is the receiving confirmation: the moment the facility system logs your units as counted and on-hand, usually delivered to you as a receiving report or a portal status change.

Subtract the first from the second. That difference is your real dock-to-stock time, measured from your own paperwork, independent of anything a sales page claims. Run this on three or four shipments and you have a pattern, not a guess.

The Evidence That Actually Holds Up

Not every document proves what it looks like it proves. A vendor can hand you a timestamp that sounds precise and means very little, so it helps to know which piece of evidence answers which question.

A manually typed time in an email is the weakest evidence of all. Ask for a system-generated timestamp instead, one your vendor cannot edit after the fact without leaving a trail. If a facility cannot produce that kind of proof, the dock-to-stock number it quotes you is an estimate, not a record.

The One Question That Exposes Which Clock a Vendor Is Selling

Ask this on the next vetting call, word for word. When you say dock-to-stock, is that measured from appointment time or from the moment the last unit crosses the threshold, and can you show me the receiving timestamp on a shipment you processed this month.

A vendor with a real system answers in under a minute, because the timestamp already exists somewhere they can pull it up. A vendor selling you a prep number dressed up as dock-to-stock will pause, then describe their prep process instead. That pause is the answer.

Ask a second, shorter question if the first one gets a vague reply. Is that number prep only, or does it include receiving. Most of the confusion in this entire industry lives inside that one sentence. The clauses worth reading before you sign anything are in the prep center agreement checklist, and the patterns that should make you walk away sit in the prep center red flags post.

What PrepVia Discloses, and Which Clock Each Number Belongs To

I am including this section because too many buyers get sold a prep number dressed up as dock-to-stock. Here is what PrepVia publishes, named against the clock it actually measures.

Prep window: 24 to 36 hours. This is Clock Three only, from the moment receiving finishes to the moment your units are staged and ready to ship.

FastLane 35H: 35 hours end to end or the prep is free. This spans check-in through departure, covering Clocks Two and Three under one guarantee with a stated consequence if PrepVia misses it. The mechanics live on the SLA guarantee page.

Median 30.2 hours from shipment creation to carrier pickup. This is an internal operating metric spanning receiving through departure, published as a median, not a ceiling.

Average ~32 hours observed until Amazon marks a shipment received. This is the widest clock of all, because it includes carrier transit and Amazon own check-in process, both outside any prep center control. It is a measured average, not a promise, and no guarantee is attached to it.

PrepVia docks sit at 8507 NW 72nd St in Miami, in the Doral and Medley freight corridor, with three docks built for this kind of receiving volume. The full production numbers and the certification are on the facts page. None of that replaces the discipline of asking, before you sign, which clock a number belongs to.

Building Your Own Dock-to-Stock Scorecard

You do not need to wait for a vendor to hand you this metric. Build the row yourself, and ask every prep center or 3PL you use to fill it in the same way.

Track four columns per shipment: appointment or arrival time, receiving confirmation time, prep complete time, and departure time. Four timestamps, one shipment, and the gaps between them tell you more than any sales page.

Run it for a quarter and patterns appear. A vendor whose dock-to-stock time creeps up every time volume rises is telling you something about capacity that no vetting call will surface. A vendor whose number holds steady across a slow month and a peak month is telling you something else entirely.

Bring this scorecard to your next 3PL conversation, whether that conversation is with PrepVia or with someone else. A vendor who welcomes the question is worth a longer look. A vendor who treats it as an odd request has probably never been asked before, which is its own answer.

Frequently Asked Questions

What does dock-to-stock time actually measure?

Dock-to-stock time measures the span from the moment your shipment arrives at the dock to the moment your units are counted, verified, and recorded as on-hand inventory in the facility system. It stops before prep begins and it does not include labeling, packing, or the trip to Amazon. Buyers ask for this number because it tells them exactly when inventory becomes something they can plan against.

How is dock-to-stock different from prep center turnaround?

Prep center turnaround usually measures only the labeling and packing step, which starts after dock-to-stock ends. A center can advertise a fast prep turnaround while its dock-to-stock time runs long, because the two clocks cover different parts of the same shipment. Ask for both numbers separately before you compare vendors against each other.

What evidence should I ask my 3PL for to prove dock-to-stock time?

Ask for a system-generated receiving timestamp tied to a specific shipment, not a manually typed time in an email. A SKU-level receiving report with a completion time, paired with a signed bill of lading showing arrival, lets you calculate the real gap yourself, independent of anything the vendor claims on a call.

Why do large buyers ask specifically about dock-to-stock instead of turnaround?

Large buyers, aggregators, and wholesalers plan replenishment and financial reporting against inventory they can see. A shipment that is physically on site but not yet counted is still invisible to their planning systems, so dock-to-stock is the moment their own operation can actually act on your stock.

Does PrepVia publish a dock-to-stock number?

PrepVia publishes numbers tied to specific clocks rather than one blended figure: a 24 to 36 hour prep window, a median 30.2 hour span from shipment creation to carrier pickup, and an average of ~32 hours observed until Amazon marks a shipment received. Each number is labeled by the clock it measures, which is the same transparency this post asks every vendor to provide.

What should I do if a vendor cannot separate these clocks?

Treat that as a signal, not a technicality. A vendor who cannot produce separate timestamps for arrival, receiving, prep, and departure is not measuring the operation closely enough to manage a peak season, and the single blended number they hand you is probably the best case, not the average case.

Final Take

The scorecard on my desk last month was not trying to be difficult. It was trying to replace a vague promise with a number that means the same thing every time it is asked. Dock-to-stock does that. Turnaround, on its own, does not.

None of this makes prep speed unimportant. It makes it one clock among four, and the buyer who only asks about that one clock is negotiating with half the information. The vendor who can name all four, and hand you evidence for each, is telling you something about how that operation is actually run.

Build the four-column scorecard described above and use it on every 3PL conversation you have this quarter, PrepVia included. The vendor who welcomes the question earns a longer look. The one who cannot answer it in a minute has told you what you need to know without saying a word.

Ask which clock, before you ask how many hours. The second question only means something once the first one has an answer.