How long does due diligence take?

There is no statutory clock on due diligence, and the range between a fast review and a slow one is wide. What actually determines where a specific deal lands on that range is a short list of variables, most of which either the buyer or the seller has some control over.

What actually stretches the timeline

Size and complexity matter most: more employees, more contracts, more locations and more revenue streams all mean more to verify. Industry-specific approvals, such as an environmental review, a liquor licence transfer, or a lease assignment that needs a landlord’s consent, often set the real pace, since they run on their own schedule and cannot be rushed by either side.

Financing adds its own timeline

A buyer relying on a lender, including one using a federal small business financing program, is also working to that lender’s own diligence and approval process, which does not always move at the same speed as the buyer’s own review. A deal with financing conditions rarely closes faster than the slowest lender involved.

What sellers can do to shorten it

A seller who assembles financial statements, tax filings, contracts and corporate records into an organized data room before going to market removes the single biggest cause of delay: a buyer’s advisors chasing down documents piece by piece. Some advisors now use AI-assisted review tools to work through large document sets faster, but a disorganized set of records slows any process down regardless of the tools applied to it.

Signs it is taking longer than it should

A due diligence period that keeps extending without a clear reason, or where new document requests keep arriving instead of narrowing toward a decision, is worth a direct conversation rather than quiet patience. Sometimes it reflects a genuinely complex business; sometimes it reflects a buyer who is losing confidence or has not lined up financing.

It does not end sharply

Due diligence tends to blur into the negotiation of the purchase agreement rather than stopping cleanly, since findings from the review often change what representations, warranties or holdbacks the buyer asks for. Treat it as a phase that tapers off, not a single date on a calendar.