For me (as a programmer) it really varies a ton. I used to put in insane stretches, due to the medication I needed to take in the past and that is how I got used to things in college.
Now I work more regularly, but still can put in a solid 6+ hr day most of the time, and yet some days… yeesh I’m lucky if I can get a third of that. So I work more on other days to compensate.
I program too; some days 11 hours, some days 2 or less. I have never been able up to do a steady schedule.
And if I code too much over a few days, I take time off to heal my brain