In a nutshell, you chat for 20, you dance for 10, you kiss for 10. At that point you take her home. Or look for another, because you've only lost 40 minutes, so the night is young...
Let me elaborate. This is no advice for the awkward, nor a revelation to the advanced. Still, it's a self-control mechanism yielding better sex. Once you can attract, you'll quickly tire of mediocre sex, which is all most lasses seem to offer.
My two proxies: 1) how she dances and 2) how she kisses. If she can dance, she can move her body/hips. If she can kiss, she's sensual. If she can do both, she's passionate and a great lay. Yet if she's hot and I am bored, I'll let a flake string me along. So while you're out, keep to my 40-minute 3-step play and you'll take home the good lay.
Cross-reference:
1) 3-strike rule: outside the SNL, she has 3 interactions to get into bed. If she texts on three different days without an appearance, you're wasting your time.
2) One-week rule: Again, SNLs aside, you meet on Thursday and haven't closed by the following Wednesday: Delete and ignore.
These two are simple self-control mechanisms, preventing you from wasting precious time, just because any woman will entertain your company. Also weeds out the girls who take dating advice from people magazine
p.s. Share the 3-strike rule with her just after you open. You'd be amazed how keen they are to please you.