While working for a company, I'd put in 45-50 hours normally, and then 70-80 during crunch which included one weekend day, but never both. I tried it once, and it's not a "7-day-workweek," it's a 12~13-day workweek, and that just messed up my damned brain.
Now that I'm subcontracting, when it rains, it pours. I like the larger per-contract payouts, but I'm honestly not sure if regular hours and a steady paycheck aren't preferable. If I felt confident that I could face a Japanese work environment again, I might try. But I'm not there yet. I'm enjoying setting my own schedule and having the freedom to start and stop when I like. And I enjoy working my ass off.