Auction times are variable.
The Request author sets the start date and time, and the end date and time for the reverse auction.
The reverse auction end time automatically extends for 10 minutes if there is a firm bid in the last 10 minutes of the auction. There can be multiple 10 minute extensions of the auction end time.
When can a bid be accepted?
A client can accept a bid at any stage of the reverse auction process, they do not have to wait until the auction deadline. After accepting a bid the client has the option to continue the reverse auction until the deadline expires (and accept multiple bids), or to close the Request once they have accepted a bid.