At my last job, I was pretty adamant, as the person who implemented Internet policy, that we should leave things relatively free, and not do any filtering or monitoring of our employees. Except for a few instances, I never had much of an argument from executive management, though I once had to threaten to quit to maintain my policy. Now I’m glad to see my philosophy vindicated.
If you’re in a knowledge business, it is simply not possible to be focused on work for eight hours straight. Anyone who believes, in a knowledge or research field, you can spend eight hours straight focused on a singular mental task is delusional, and probably, to be blunt, not smart enough to ever have done that kind of creative work. Designing a drug is not even remotely anything like assembling a car in a factory.
You need some mental relief from the day. In tech, I’d take a break when I could no longer make headway on a problem. You get to a point where you kind of hit a wall, and you need to step away from the problem a bit. When you come back to it, often the answer is obvious. I’ve had more than a few cases where I’d step away, go read an article on an unrelated subject, then come back and see the error of my ways immediately.