It has been over two weeks since 3 of my orders have been marked as complete. None of them have changed from ‘Revenue for Order Completion’. I have withdrawn once a few days ago, but I am not sure what is going on right now.
It takes 3 days to fully mark as complete after delivery if the buyer does not mark it as complete. (I am sure you know this!)
It then takes 15 days (not 14 as the ToS says) to actually be available for withdrawal.
If it has been longer than 18 days then head to http://support.fiverr.com and submit a ticket!