I’ve done three half-days of coding (20 minutes at a time) in a row with no hand pain the following days. The consequences have been limited to tightness in the abductor digiti minimi and the the thenar eminence.
I had some carpal tunnel sensitivity in the previous week, and wrist pain the week before that. The week before that was when I had the a.d.m. injury from snow shoveling.
I think I’m on-track to ramp up to more keyboarding and some guitar playing next week when the guy goes back to in-person school, which should clear up a lot of time.