I envy people who can change into "I just do what I have to do"-mode when they don't have 'skin in the game' ... I always feel as if I have skin in the game and get stressed even on the most ridiculous projects where I knew (and stated) from day 1 that this just won't work the way it has been envisioned by higher ups.
You need to remember, whether you put 40, 60 or 80 hours p/w into a death march project, won't be recognised. Everyone will be too busy to tally who's working more. By sacrificing more of your free time, you are just working for free for the people driving the project, who may be doing this purely for political reasons. You will also make it more likely for similar projects in the future.
I maintain it's better to not overstretch yourself and let the project fail. Better for your health, and better for the company, so they manage the next project better and have workers who aren't burnt out.
Yes, there needs to be a captain of the ship, and when she tells you to do something, you fucking do it because that's what captain means and you can kvetch about it when you're back on land.
But if the captain is making all of the important decisions, something has gone terribly wrong and your boat will not function. The captain is there to
1) make small changes necessary to stay on a long term course
2) push decisions through in moments when speed is critical
3) break conflicts that can't be resolved
They are not the chief achitect or the chief strategist or the chief anything really.
And if you are both the captain and the chief strategist, you need to recognize that you're playing two roles in one body and you need to be very aware at all times of when you're wearing the captain hat and when you're not. You don't get to boss people around when you're doing strategy.
I personally love it when higher-ups make a decision without consulting me. Because then I have zero skin in the game. I don't work ridiculous hours. When I am involved in decision making, then I make sure project succeeds. Sometimes that means working late hours, taking pro-active steps to remove blockers etc.
But if I am told what to do without consulting me, then I don't care. There is a lot less stress on me. If it appears decision was stupid and project will not meet deadline, I make sure everyone knows and rarely ever put in more than 40 hours on such projects.