Jenna has been sttn 8+hrs since 2 months - still very very full in the morning but not painful - has been the same since she started. I haven't really noticed a difference.
When she was STTN, it only took a few days to a week to even out, but then she suddenly started waking up again, 2 or 3 times a night, so I really don't have engorgement to worry about at the moment... lol!
You might get more answers on the BFing board. GL!