I do 6-10 hours per day, depending on the day. My team has quite good WLB. I have heard of other teams that are more pressured, but haven't spoken directly to those teams.

Compared to my previous... 4 jobs (+1 company founded), this is the 2nd lowest stress. The one lower stress job had 1/3 the compensation, no career growth, and was just a "marking time" federal tech job. YMMV.