A good historical counter point to this is how Jason West ran the IW development team from 2002 through 2009.
Mandatory crunch was limited to a few 2 or 3 week sprints per game, for key milestones like e3 and alpha. Regular work hours were 10am to 7pm. Crunch work hours extended that to 10am to 10pm, Monday through Thursday. An extra 12 hours per week. There as no mandatory weekend crunch for Call of Duty 1, 2, 4, or MW2.
Individuals that wanted to work extra hours could do so. For myself, I did what I called "18 months off, 6 months on". Meaning I would have a life outside of work for 18 months, and then to ship I would remove myself from all other obligations and focus on the game. Even so, it would say really only three to four months were very very intense, and even then I didn't work that much on the weekends.
It's important to highlight that engineers were not tasked with more work than they could do without crunching. Not crunching was a top priority. Jason adhered to strict scheduling of the engineering department. He believed that over time, people are more productive not crunching than if they did crunch in the same period.
Since Jason stopped making CoD games, the number of hours it takes to make one has risen at least 6x, and probably closer to 9x.