I own you, and you're easily replaceable.
<i>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.</i><p>Then you're doing it wrong at Caltech.<p>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.<p>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.