HOW do studios crunch and work long hours consistently every week?

The first 6 months of this year are going to be INTENSE for my work. I've just come out of January feeling like I've gotten off a rollercoaster: a bit thrown around, but exhilarated. (I'm very excited for this year)

HOWEVER - I work 28 hour weeks. I go in, get some great work done and get to rest in my evenings + 3 day weekends.

Genuinely asking, how does anyone maintain consistently long and intense work hours?