“In addition to the usual work-day schedule, I expect all of the members of the group to work evenings and weekends. You will find that this is the norm here at Caltech.”
Then you’re doing it wrong at Caltech.
We are often quick to assume that MoreHoursWorked = MoreWorkGettingDone. This is true up to a point, but false beyond that point. Personally, I believe that evenings and weekends are usually beyond that point.
I used to work 90 hours per week. But when I decided that I needed to get more done, I started working 60 hours per week. Results per hour and quality of results have both improved dramatically, so I’ll never go back. And I would never work for anyone who doesn’t understand this.