[Incel]

There is a brocel who's an oldcel ("Iranianoldcel", Lonely Old Man) and he posted something that I respect and suggest to all of the youngcels and not only to them because there are many other unexperienced elder incels too. Read it carefully!

You can tell if a girl is interested in you in just a few minutes. It doesn't take months to understand if she's into you or not.

...

Next time just straight up ask your crush out for a coffee or something if you're really into her. If you wanna talk before asking her out,you can do it, but no more than 2 days. otherwise it's a waste of time and energy.

[MSL]

 Well said, but I'd like to add some important details which you better not to ignore:

 In some cases the females at the beginning doesn't like you but later they may develop feelings. So, if you really, really like the girl/woman, you may give her more time.

 In case it's not oneitis (one-it-is), but just someone who you think is "I like her but I can like and find easily another one like her too.", then as the Iranian oldcel said 2 days (or up to a week at most) because your time (and energy) are a sort of capital which you may invest in other healthier and more useful actions.

[Dimitroff]

Lead reasonable life, young people.