How long does it take for a scab to form over a cut?

It usually takes a week or two unless you do something about it.

Put honey on your scab to let it dry.

Then wipe it off about 10 minutes.

After that put some toothpaste on it to let it dry.

It drys up the skin to help the scab fall off

I hope i helped

P.s. If this doesnt work, try cetaphil