A Tip From a Female:
wait 2 days, 3 days is too long and after that, we dont care. 2 days gives a chance to tell our girl friends "OMG, like OMG! I just meet ....and he was SOOO hot!"
then the next day, her friends will ask "Did...call you yet?? huh? huh??" and of course, she'll say "No......wonder why!! i mean, i THOUGHT things went well! hmm...."
so, the 2nd day (at night) is the BEST time to call.
~Baba~
