Unpopular opinion: the cost of keeping people up there is astronomically (pun intended) high, so it’s only natural that they are expected to work way, way more than us here on the ground.
We may take a vacation and it’s alright. They take a day off and burn hundreds of thousands of dollars as they do so. Their rest is paid by insane amounts of primarily taxpayer dollars. Their schedule must be packed, and only the individuals capable of sustaining such workloads in space conditions should go there in the first place.
After that, indeed, they deserve a very long vacation to restore.