I have some Hiut denim upstairs which I’ve never washed, had them over two years.
Those fades are going to look orsum if I ever do get round to running them through the machine.
The only wash of any significance is the first wash. Wearing the jeans for some time before the first wash causes the dye to fade in a way that highlights the creases etc. If the denim is washed while it’s still relatively new the dye will fade uniformly
Depending on the dye etc. some will continue to fade over several washes, making them far lighter as the (I think?) weft comes through.