Most Helpful Girl
A couple of days or so. There are no rules.1
Most Helpful Guy
I've gotten girls to agree to a meeting on tinder after about 5-7 texts. If you start out texting her with a decent first conversation (any kind of back and forth conversation at all is decent) just wait until the point where there's not much else to say and randomly ask her if she wants to do this thing or that thing.
In case you were wondering when there's not much else to say, its the point in the conversation at which you would ordinarily become bored if you werent already talking to a cute girl with the purpose of asking her out. lol. So its like "do i really want to say this next thing?" vs "am I just delaying the point at which I might be accepted for a date?"0