Going the opposite direction, I'm working 80% (32 hour weeks) by choice and it's awesome. I have so much more time for other interests and family and it's much less stressful. Of course I only get paid 80%, but that works for me.

I'm doing this at a major computer company and my management is supportive. Nonetheless, it took months of discussion and needed to get approved by the VP. And it's probably hurting my "career path".

Culturally, I find people don't understand working less than 100%. You have Friday off? Is that vacation? Is that a partial layoff? (I'm male, and in the US for context.)

Overall, it would be nice if working less than 40 hours were an option for more people.