Which startups treat non-working hours/days with respect?

I feel there may be a disconnect between reality and expectations behind this question.

Building a business from scratch is a huge effort and not usually compatible with a 9-5 schedule, leave early on Fridays especially when the team is small.

In general you're better off working at a later stage startup if you want reasonable hours. I started working at a startup after it raised a Series A and then left a year after it raised its Series C; in that time I went from working 9:00am-7:30/8:00pm to 9:00am-5:30/6:00pm with the occasional late working day.