Every 3-4 months. When I used to go to a hairdresser at our closest shopping centre, it was costing $120-140 for a cut, colour, foils. Now we have moved, I went to the one in the main street here and it cost me $85. Very happy with that.
Sometimes I get really slack and wont go for close to a year, but I love going and for $85 I think it's worth it for a couple of hours of me time.