Every place I've worked as an FTE, the focus was on the job, not the hours. In fact, I've had many bosses say as much, usually implying that after hours work might be necessary and they'd expect me to take it uncomplainingly.
And I have, though it's always tempered by two things, namely, A. If the job routinely requires > 40 hours a week, then the job is poorly defined and we need to modify expectations, and B. That if I'm working to the job and not the hours, it doesn't matter if I only put in 30 hours one week, if the work is being done (and, likewise, if THAT is routine, the job is also poorly defined, and I need to ask for more things to do).
And I have, though it's always tempered by two things, namely, A. If the job routinely requires > 40 hours a week, then the job is poorly defined and we need to modify expectations, and B. That if I'm working to the job and not the hours, it doesn't matter if I only put in 30 hours one week, if the work is being done (and, likewise, if THAT is routine, the job is also poorly defined, and I need to ask for more things to do).