How long does seed due diligence take?

Two to four weeks from signed term sheet to close is normal, and a well-prepared company with a straightforward cap table closes at the fast end. Party rounds with many small investors take longer than the same amount from one lead, because each investor runs their own process on their own timetable.

How long does Series A due diligence take?

Four to eight weeks, and the spread is mostly the corporate record. Financial and commercial diligence run on a fairly predictable schedule; legal diligence takes as long as it takes to reconstruct whatever is missing, and that is the part with no floor.

What is confirmatory diligence?

The check after the term sheet that the things you said are true: the documents match the representations, the cap table is what you showed, the contracts say what the summary said. It is not meant to change the deal, and when it does it is because something surfaced that nobody knew about, which is the outcome preparation exists to prevent.

Can diligence kill a deal?

Rarely on its own, and often as the final straw. What kills deals is what diligence reveals: an IP gap, a customer concentration nobody mentioned, a co-founder dispute, financials that move when questioned. The second effect is slower and more common: every week of delay is a week for the market to move, for the lead to get distracted, or for a partner to reopen a question that was settled.

What can we do before a term sheet?

Everything except answer questions specific to that investor. The corporate record, the cap table traced to documents, closed financials with explained variances, customer and vendor agreements collected, IP assignment confirmed for everyone, and the team documents in order. That is the majority of any list, and none of it depends on who the investor turns out to be.

Does a data room speed it up?

A folder with the right documents in it does. A folder with old versions, duplicates and helpful extra material slows things down, because the investor now has to work out which version is current and you have to answer questions about documents that were not relevant. What speeds diligence is that each item is present, current, and obviously the right one.

Guide

How long investor due diligence takes, and what actually makes it slow

From signed term sheet to money in the bank, a seed round usually takes two to four weeks and a Series A four to eight. Almost none of that is the investor reading. The elapsed time is round trips: a request arrives, you look for the document, you find a version and are not sure it is the current one, you ask your lawyer, the lawyer asks a question back, and four days have passed on one line item. Diligence is slow in proportion to how long each answer takes, not how many questions there are. A company whose record is assembled before the term sheet answers most of the list in a day and spends its diligence period negotiating rather than searching.

By Vanward. Published 2026-09-16. Updated 2026-09-16.

Founders plan the raise around the pitch and treat diligence as an afterthought that happens to them. It is the longer half, and it is the half most under your control.

Where the days actually go

Phase	Typical elapsed	Who is working	What stalls it
Term sheet to kickoff	2 to 5 days	Investor counsel, your counsel	Engaging counsel late; agreeing the request list
Document request list	1 to 3 weeks	You, mostly	Hunting for documents; version uncertainty; one person holding everything
Legal review	1 to 3 weeks	Investor counsel	Gaps found in the corporate record; ratifications; missing signatures
Financial and commercial	1 to 2 weeks, in parallel	Investor, your finance function	Numbers that move when questioned; no explanation for variances
Disclosure schedule	3 to 7 days	You and your counsel	Written last, from memory, under a closing deadline
Signing to funding	2 to 5 days	Everyone	Signature logistics and the wire

The row that varies most is the second, and it is the one entirely made of your own preparation.

Eight things that add about a week each

None of these is unusual. Most companies have two or three, and each one is a week if it is discovered during diligence rather than before.

The gap	Why it costs a week
A grant approved but never documented	Board ratification, a stockholder consent, and a disclosure item
A contractor with no IP assignment	Tracking down someone who left, and a signature you cannot compel
Financials with no consistent close	The investor asks a question, the answer changes the numbers, everything is re-reviewed
Customer contracts only in an inbox	Collecting, checking for the signed version, and confirming amendments
A stale or missing 409A	A new valuation takes two to three weeks on its own
Revenue recognition nobody wrote down	A policy has to be written and applied retrospectively before the numbers are trusted
No organized record of consents	Counsel reconstructs the corporate history from email
One person holding every document	Everything queues behind whoever is traveling or ill that week

What compresses it

Assemble before the term sheet

The request list is largely predictable. Build the record against it while nothing is pending, and the diligence period becomes a review rather than a search.

Keep one current version of everything

Most of the delay in the request phase is not absence, it is uncertainty: three files with similar names and no way to tell which one was signed. One place, one current version per item, with the date it is good as of.

Write the disclosure schedule early

It gets written last and under pressure, from memory, which is how things get missed. Keep a running list of exceptions as they arise and the schedule becomes an edit rather than a reconstruction.

Answer in hours, not days

Momentum is real. A list answered in two days reads as a company that runs well, and that impression carries into how hard the remaining questions are pushed. The same list answered over three weeks invites more questions, because the investor starts wondering what else is slow.

The honest version

Preparation does not make an investor decide faster. It removes the reason for the gap between deciding and closing, which is where deals lose weeks and occasionally lose themselves. The work is the same work either way. Doing it early means doing it once, calmly, without a closing date in the calendar.

Questions founders ask

How long does seed due diligence take?: Two to four weeks from signed term sheet to close is normal, and a well-prepared company with a straightforward cap table closes at the fast end. Party rounds with many small investors take longer than the same amount from one lead, because each investor runs their own process on their own timetable.
How long does Series A due diligence take?: Four to eight weeks, and the spread is mostly the corporate record. Financial and commercial diligence run on a fairly predictable schedule; legal diligence takes as long as it takes to reconstruct whatever is missing, and that is the part with no floor.
What is confirmatory diligence?: The check after the term sheet that the things you said are true: the documents match the representations, the cap table is what you showed, the contracts say what the summary said. It is not meant to change the deal, and when it does it is because something surfaced that nobody knew about, which is the outcome preparation exists to prevent.
Can diligence kill a deal?: Rarely on its own, and often as the final straw. What kills deals is what diligence reveals: an IP gap, a customer concentration nobody mentioned, a co-founder dispute, financials that move when questioned. The second effect is slower and more common: every week of delay is a week for the market to move, for the lead to get distracted, or for a partner to reopen a question that was settled.
What can we do before a term sheet?: Everything except answer questions specific to that investor. The corporate record, the cap table traced to documents, closed financials with explained variances, customer and vendor agreements collected, IP assignment confirmed for everyone, and the team documents in order. That is the majority of any list, and none of it depends on who the investor turns out to be.
Does a data room speed it up?: A folder with the right documents in it does. A folder with old versions, duplicates and helpful extra material slows things down, because the investor now has to work out which version is current and you have to answer questions about documents that were not relevant. What speeds diligence is that each item is present, current, and obviously the right one.