[resonanormal]

I work 4 days a week. 8hrs a day in Zurich. It's generally accepted at companies if you have a child.

I have previously worked 3 days a week in Berlin as it's the law to allow you to do so for 3 years after your child is born.

I think 3 days a week is definitely the most optimal as it's 4 days off 3 days on per week. Meaning the balance is in favour for your personal time.