How long should I wait before I call?

Call him!! Sometimes guys think that the longer they wait the more "cool" we think they are. Cut him some slack and give him a call. Good luck!

Ohhhhh noooo don't wait...pick up the phone and call him and tell him why he hasn't called in four days ,why he couldn't call too see how was you doing or if you was still alive ..because I hate when a guy gets mad when there girlfriend don't call but when they don't call they think its alright

If he is really interested he will call you. Maybe he is just busy right now or something came up with his family , etc.. and he will call later. If I were you, I wouldn't call him unless later (like weeks later) you want to invite him to a party you are having or something.. and you are also inviting lots of other folks.. but, generally, I wouldn't call him now..