Depends on the kind of interaction I had with the girl and the length of it.
Usually the shorter the interaction, the more swiftly I need to move to keep the connection alive. Meaning, I'll shoot her a text the same night I met her.
With girls that I've really connected with, kiss closed at the very least, I wait a few days.
And also don't get your hopes up. With girls you meet in clubs, you never know what's going to happen once their high wears off. Gotten girls numbers at bar close after a 2 minute convo and had them wanting to meet up the next day. Meanwhile, I've spent a long time with girls, thinking I had it in the bag, only to have them never respond to texts/phone calls.
You never know.