I also have a friend at Google successfully requesting a 60%, but they had to change team to do so. They also experienced pushback for it - I'm sorry it went the wrong way for you.

Sorry to hear you had that experience. I’m sure it’s a YMMV type situation and it’s not guaranteed. The few anecdata points I have show that people have done it successfully. But certainly it’s small numbers.

Sorry to hear this. Hope you found somewhere better now. In my experience with 4 day weeks - in the public sector e:g gov't, academia, it really means that. You can chill , do caring responsibilities, whatever on the 5th day. And ironically, as result you are more productive the other 4 days. Whereas the private sector is patchy. In a corporate like Google, its less likely to work. I worked for a large US corp where they allowed compressed hours. Still 4 day week but just tiring long days instead. Where they have systems comparing peoples performance on the same grade against each other (a bit like apples and oranges. ;) ) , doing PIPs etc, someone working less hours may be hurt by getting less work done at times. That's fine, because for 80% of the salary the employer should expect 80% of the work (in practice they probably get 85-90% so its a bargain). However, private employers in particular can be rigid and just see that person as having done less. If there's internal politics and everyone's trying to look better than others, sometimes working 4 days makes you miss a crucial meeting and be out of the loop of what you need to do to impress Manager X by end-of-year. Public sector by contrast, its in the culture, for years plenty of people working part-time including some senior managers, more women in senior positions who previously juggled work and kids and know what its like, and, it just works. The work gets done.