Gave my phone number to a guy today...when will he call/text?!?

I was at a local concert tonight with my friends. The guy that worked the sound system was soooo cute and we had a staring match at each other for most of the night. I kept looking at him and he kept catching me and looking back. It definitely seemed like he was interested. So I decided to give him my phone number. I went up to him at the end of the show and said, "I'm going to be really forward and tell you, I think you're really cute. You should call me sometime..." and I handed him the piece of paper with my number on it. Then he smiled shyly and said "I will." How long does it usually take boys to contact the girl...when do you think he will get in touch...? (: