[brogrammernot]

To an extent, yes.

However, I would say typical early stage startup work is 55 hours/week.

Basically 10 hours day through the week, and a couple hours on the weekend.

[TP4Cornholio]

What's your experience on the average workweek for mid/later stage startups?

[brogrammernot]

Again, n=1 but I've experienced and have friends who have experienced around 50 hours/week for mid/later stage startups.

The stress is lower because you usually have more cash flow or significant rounds that make the work more enjoyable and you have a better comfort of working overall.