While crunch time are necessary sometime, you should do your best to balance things out. Worked extra hard all week? Take half the next week off and go camping.
It was more like a 14 month death march of 100+ hour weeks, so there really was no "next week", as there was no end in sight for most of it. That's what it is like with hardware, especially late hardware that the entire company is riding on.
After the thing finally shipped, most of the team effectively took off the next 4 months, working ~4 hours or fewer hours a day, etc. But those 14 months were hell.
After the thing finally shipped, most of the team effectively took off the next 4 months, working ~4 hours or fewer hours a day, etc. But those 14 months were hell.