How long must you know someone before you can start dating them?

A exchange of numbers at the bar or months of being friends with the fear of being stuck in the “friend zone”.

If you’re interested in someone you recently met, checked his or her backround to ensured your findings and still continue to like them, would you date them? How long will you wait before you make your move?

Possibility of them being taken by someone else if you waited to long etc