My answer to How long does it take to award a government contract?
Answer by Ken Larson:
The type of product or service is a big driver.
A simple off-the-shelf item can be bought under the commercial contracting provisions of the Federal Acquisition Regulationor off a GSA Schedule in a matter of days on a small business set-aside contract.
The design and development of a new fighter aircraft, to include writing the specification, seeking industry comment, issuing the Request for Proposal on FEDBIZOPP, down-selecting the winner, negotiations, clearing protest actions, if any, and letting the contract can take as long as 2 years in my experience.