Hello, yesterday i had sex with my boyfriend and was cut their frenulum. it was a slight cut but bled enough. in how time it heals?

Few days: I dont quite understand the question, but in a younger, healthy person, a slight cut should heal within a few days, may put antibiotic ointment to heal faster, have it checked if not healed or getting worse within a week or two.

Pretty fast: In areas with good blood flow (or good circulation ) healing is fast. And this is one of them, it may be why you saw a lot of bleeding.