How often you actually need a cut
Four weeks is a barber’s billing cycle, not a rule about hair. Here’s how to read your own growth instead.

Four weeks is a barber’s billing cycle, not a rule about hair. It became the default because it fits a calendar, not because it fits a head.
What actually decides the interval is the shape you asked for. A tight skin fade is unrecognisable at three weeks because the contrast that made it work has closed. A scissor cut with length on top can go eight weeks and only look softer, not wrong.
The honest test: stand in front of a mirror at the end of the day, after your hair has done whatever it does. If the shape still reads, you have time. If you are fighting it with product, you don’t.
Tell your barber how long you want to go before you sit down. It changes the cut, not just the booking.