I wish companies understood this. Part of my boring non-startup job consists of occasional weeklong sprees of 20+ hours/day, staying on the jobsite the entire week, with no additional compensation.

I'm definitely dead inside by the weekend, and noticeably affected after the first day. The logistics of what I do probably really does make it somewhat of a necessity, but I wish there was at least provisions for comp time afterwards or at least some kind of bonus pay.