I know a girl that works at a hair replacement salon.

They have a client who is in a band. He does long bangs, and the rest is shaved down to 1/4 inch. She said it looks fine.

I've got hairs on the sides when I shave it down to skin for the mohawk look that are probably 1/4 inch long. The key is to styling it with product so that it blends in properly.