Say your going to be at a bar for awhile (hours) and so is the girl. How long do you talk to the girl and hang out with her before getting her number typically? I like talking to a girl for awhile but can only do it for so long before I run out of things to say so I will get her number and say I'm getting back to my friends but I feel weird seeing her walking around the rest of the night and not saying much to her. Does anyone approach and come back multiple times?

You don't have to restart a full on conversation when you see her again that night. Just throw a comment her way like, "Hey Trouble!" Or "Are you stalking me?" Or "You know I just can't tell when you look better, walking towards me with that great smile, or away from me. *wink*"

If you want to restart the conversation, ask for her opinion on something, or ask her to dance, or do the 5 question game. Then assuming you haven't found anyone else you would prefer to make out with or even take home that night, you can escalate kino run the kiss close gambits. If you can kiss close there's a chance you can get her back to your place too.

Hope this helps.