Depends on the dude. Some are just on that

game and are onto the next dikk within 24 hours. Others go completely psycho and don't let go for a very, very long time.
It's hugely dependent on the social market value of the guy. If a girl knows that she'll have an extremely hard time getting wifed up by a dude of that high of caliber again, then she'll go nuts. If she was of similar or higher social market value to the guy, then she gets over it much faster.
If she's going ape over you, you're probably doing something right.