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It really depends on the agenda behind the phone call. If you are trying to set up some sort of date or meetup, that type of stuff shouldn`t take more than a few mins; 5 mins tops. I`m not a big fan of "phone game". I think you should use the phone to set up face-to-face meet ups, then run you game when the chick is in front of you
Typically this is true for girls you're not-so-serious with and just keeping it more casual but also girls actually love when guys take the time to talk on the phone with them for a good decent of time. It's a necessary skill for when your in a relationship too. Once things ever start getting serious with you and a girl, she's going to expect you this so be prepared.