At peak I (barely) juggled 7. I’m down to 3 now though because the sleep deprivation and stress was too much.

I still meet all deadlines, support the team, and meet or exceed expectations in performance reviews. That might be why it’s a little harder to maintain, I know people who don’t give two shits about that stuff.

I’ve probably taken years off my life, but I’ve bumped up being able to retire a little earlier so I guess it evens out.