Belgians, at what frequency do you go to the hairdressers and what do you pay?

Watched a documentary (from US) and guy of the barber shop says he has a lot of customers who come in every 2-3 week. I was kind of shocked by the short frequency and not sure this is normal in Belgium. I know price can vary a lot (in my city for a male easy 10 to 32 euro) but the topic is more about the frequency.

Gender: Male

Region: Flemish-Brabant