I play for 1 to 2 hours at least once every 3 days or so, when I'm back home. Usually same game for the whole session. If I want to play multiple games I always start with IIDX because it has the tiniest timing windows, so I'm accurate af when I switch from IIDX to another game. While switching from a more permissive game to IIDX makes me play awfully bad.
I think I happen to sometime spend the whole day playing if I have a day off or during week-ends.