maybe i'm gonnna be the first person to not lie or over exagerate? lol... depends, if i got booze or pills in my system, i have to stop when i start hurting my wife, cuz there is never going to be a finish, if i'm just sober, usually like 15-30 mins, any longer tho and i'd just end up hurting her and i wouldn't be able to breathe (smoking for all these years has done a number on my lungs) so it's best that way...

edit: ok after reading some more of the farther down posts, i realize there's quite a few who aren't giving ridiculous ammounts of time.... lol