Make fetchmail leave mail on server for a specified period of time?

I know that fetchmail can be configured to leave mail on the server (usually done with the keep uidl keyword combination), but is there a way to configure it to leave mail on the server *for a specified minimum period of time* and delete them thereafter? For example, suppose I want messages to remain on the server for 48 hours after they have been downloaded, and then be deleted on the next fetchmail invocation against that server. I am mostly interested in solutions that work with POP3.