PDT is basically on the last of the '05 F/O's for upgrade now. There are still many F/O's senior to them that have not upgraded for whatever reason too. That said, there aren't many F/O's with an '06 hire date remaining, and there are hundreds with '07/'08 hire dates.

PDT Mgmt. said about 2 months ago that they are "looking into" reducing upgrade time (although they didnt mention any numbers).