I plan on doing something similar. I am in the running for a different job. They want to pay me slightly less than I want, so I am going to offer to take the pay but in exchange only work 32 hours.
Time has way more value to me.

Rubbing against the grain. They don't like that. I dig it, but most jobs, unfortunately, don't.

It's a wonderful thing to find a workplace that understands and accepts this.

I told my boss exactly that, "I only work 6 hour shifts," right from beginning of the interviewing. Made it abundantly clear. I can get my job done in two less hours that can be better spent doing other things.

I only work 6 hour shifts...