More in the fall, winter and early spring than in the summer.
I used to try to write every day, but now it's probably every other day during the fall/wtr/spring and once a week (or less or more) during the summer.
I don't really keep track of how many days I write because I always tend to be writing or creating. If I find myself cranky and annoyed, then I know I haven't written in a while.
I can usually tell when something in my world is out of balance and try to respond to that with my actions.