Depending on the chick a couple of hours on the same day, get them off whatever app you've met them on and get their real number for watsapp or texting asap.
Always smart innuendo first, just littered through the conversation. Once you get them to cross that threshold with you, we all know what time it is. The thing is it should always be about buildup never explicit and obvious from the jump. Have had to learn that lesson, that and sending D pics even if we were both chatting dirty, that will switch a chick off right away in most cases.
But you can tell how things are going to go in the first 20 min of talking to someone. Chicks who love to collect simps can be spotted a mile away.