Anecdotes obviously aren't data, but from my own experience going some time jobless after my last startup I was basically useless for the first three months. By month four I started looking for some things to do and excuses to regularly leave the house. By month 9 I had a bunch of side projects and hobbies going on. Some productive, some artistic, some just screwing around.

Then I got a job I liked, and while some of the hobbies were still quite active for the first two months or so they've all come to rest now. Still trying to figure out how to get a better work-life balance again, because I quite liked those hobbies