How long should I wait to call him back?

What's the situation for calling him back? If it's after a date, then not the same day. If it's just that he wants you to call him again when he was distracted from conversation with you, then call the same day, most likely within the hour.

Call back that day. It's rude to not call back that day. It depends on what he is doing. If he tells you what he's doing, then guesstimate how long it will take him and then call him back. If not, call him back an hour later. Or if you aren't sure, tell him to call you when he's done.

Well if he likes you, he most likely WILL call you back. But he has to say he will call you back to make you feel good. You ever saw in movies when at the end of their date they will call you back? But never usually do? Well you're in this situation! Unless he's your best friend. He will call you back!

I would wait a day. Make him sweat it out a little bit at least. He needs to work for it.

I usually wait a few hours. don't wanna look desperate!