How do you avoid time wasters?

Let’s say you go to a bar, chat to a girl, the energy is good, you drink, chat, touch, she refuses to kiss but keeps talking and flirting with you. How do you decide when to move on to another girl?

Another scenario, you do daygame, talk to a girl, she agrees to an instant date - how do you avoid spending a whole day with a girl who may not be into you?

I have wasted so much precious time on girls who ultimately refused my escalation and advances, I’d really appreciate any ideas on how to cut my losses. Do you leave if she refuses to kiss you?