For me, it needs to be more than weekly. I seem to build up a debt of "something" which seems to be resolved by doing something I love. Mostly this had been walking, surfing, hiking, reading, gaming, rugby, and so on. And now it is impossible to get time for that. Once a week we each get to do something for ourselves, but only for a few hours. Looking after the two children alone is tough for either of us, so we don't leave the other person alone with them for too long.
It seems to have impacted me far worse though, for whatever reason. I never knew what depression actually was before I had children.