Hello,
I think that Few client go offline immediately after downloading the sourcefiles and not completed handover. In this situation, we have to wait for the 14 day's to complete handover process. If the client has an option to extend the handover period, then it is not advisable to keep this period for 14-days. It should be for two or three days only. If the client needs then he can increase the handover time limit.
Anyway, most of the revision process has been done before the winner is declared. 14 days are not required for uploading files and downloading by client. If any revision is left and is going to be long, the customer can extend this period.