The call back - for girls

i usually like a guy to call me 2 days later. if he calls the next day it makes him look desperate, but if he waits 3 days it makes it look like your not that interested. then I lose interest. there's really no time limit on how long you talk. it depends on how the conversation is going. but towards the end of the conversation you should ask her when you can c her again and take it from there.

I would keep the conversation short and light, since you don't know her that well. Set up a date, so you can talk to her some more. Having a full blown conversation on the phone might seem like a good idea, but if you don't know her then you will have a hard time because you can't read her body signals or put her words into context, which will strain the conversation and make it difficult to talk to her later.
Not to mention that if you call her back and have a big conversation with her, all she will be thinking about is when you are going to mention a date. Good luck!

After getting a girl's number, you wait 2-3 days to call so you don't appear desperate (girls run from that), but then you need to kinow what length of conversation to have with her. When you do call her, try to stay off intimate subjects, and try NOT to talk about other people in a negative way, especially other girls. You never know who she might be friends with.
Keep the conversation short and sweet and make plans...OK, but my best advice to you is to let the conversation flow freely. You should be able to tell when you run out of things to say or when she seems bored or tired (pitfalls of long conversations). Keep it sweet, but let the length of time go. Sometimes, with the right person, two hours can fly by in minutes; you'll be so caught up in her voice, and she in yours, that time won't matter.
HANG ON TO THAT ONE!
She could turn out to be the best thing in your life!

In general, most women and girls already like you if you get their number. The call and the plans you make are really secondary to MAKING the call. Topics will flow naturally. If they don't, then you're with the wrong girl.
Hope this helps. I have been in your shoes many times and know how you feel.