Yes. When I was at my strongest (max DL was 525lbs, sadly I'm only in the 400s now) I spent only that in the gym. Lifting weights is both a physical and mental exercise that most people can only continue for ~45 minutes. Anymore than that and it's often useless work because it's not at a level that's still challenging.

Powerlifting tends to make for longer workouts because I would take more rest between sets. When I would do BB or cut workouts I would be in the gym ~30 minutes. Keep in mind that this 30 minutes was full on balls to the wall intensity. It's the intensity that matters and not the time. Also, many people do not know true intensity. I know I didn't learn it until I started doing BJJ training and puking multiple times during 1.5 hour sessions. Protecting yourself and competition has a way of drawing people out to the very edge of what they are capable of.

There was an article recently in Outdoor magazine where even amateur marathon runners are training differently. Instead of slogging out many many miles, they have cut miles and are doing less work but at maximum intensity.