I think if you really liked her, it would be very nice to call her the next day and tell her you had a really good time. You can also tell her that you are going out of town for a few days, but didn't want her to think you weren't going to call, and tell her you were hoping to set some plans with her when you get back from you trip.

BTW - I think that 2-3 day rule only applies to the first time you call, not after you have already had a date.

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