Technically, mine changes every couple of months. Many many years ago I started dying it blonde (originally for Glastonbury, but I liked it, so I kept it), but as the years have passed I’ve been getting it cut shorter as I’ve been going balder.
So these days I’m on a roughly two month cycle of
- dye hair
- hair get a bit long
- go to the barbers and get a number 3 all over
- remaining hair is so short it’s just the dark brown roots
- back to step 1
Sometimes, if I don’t have much on socially or I just don’t get round to it, I go two haircuts without dying and end up brown haired for a few months.