If you call a girl and she doesn't answer, how long should you wait to try calling again?

You should wait until she calls you back. OR if she didn't call you back, then the next day call her again. But, never twice in the same day, unless you are dating her. If you guys are dating and a 'thing' then, you can call her about an hour later. If she still doesn't answer, try later that night. Or send a simple text. But, don't do it right away. One after another. She is most likely busy or not in the proper area to talk to you.
I don't know about most people but I won't call people back unless they leave a message. So, I don't know if you should wait for her to call you back...
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What I would like is for the guy to leave a message or text if I missed his call. I normally would return a missed call anyway but many girls don't if there's no message. But if you want to try again, then wait till the next day.
always leave a message, don't just call and not leave a message. if you do that, then wait for her, you don't have to call anymore
Honestly, coming from a girl, wait til she calls you back. There is nothing more annoying than having a guy constantly checking up on you or whatever.
call her once, and if you don't want to leave a voice mail then send her a text after your call.
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