few days, a week maybe?
i mean, it's certainly a good idea not to put out the first night because it builds the desire...
I once waited 6 weeks (but the girl was 22). Since then, the most i had to wait was 1 week and a half. 2 weeks would have been too long honestly, we're adults.
in a number of dates: I like 3 but usually end up doing the nasty at the second