ahhh need some advice 😊

so some hot dude walks into my work and apparently had a problem earlier in the day so he was told to come in later and to see me. so I'm all nice and taking care of the problem. And he's fucking hot so I'm being extra nice 😏 he ends up leaving but I keep looking at him and every time I do he's looking at me. so that's was an ego boost. this motherfucker comes back in like 10 minutes later because he 'forgot' something. so while he's walking around, I casually lean over the counter to show off my cleavage 😜 and he walks up to the counter and we just start talking about random shit. And he asks me if I have a boyfriend and I'm like nah. so he takes a piece of paper and pen and writes his number down and says to hit him up if I want. And as he leaves he YELLS "by the way you're really beautiful" and I try to stay calm lol soooooo my question is when do I contact him? Like how soon is too soon?