Work hard and go. If you have energy after an hour, you have been talking too much. Hang out if you want, but I have other things to do.
Depends what your goals are, olympic weightlifting and powerlifting training sessions can easily last 2 hours for competitive lifters. Some people just like hanging out and lifting even if they don't compete, I agree it seems absurd to spend hours in the gym every day but I still give these guys props, it's better than sitting on the couch watching TV.
I used to workout 5 days a week, did a couple years of CrossFit including one at a CF gym, trained olympic lifting only for half a year etc. I love the challenge and seeing the progress. Spent lots of time reading and posting on lifting forums, it was one of my main hobbies along with skiing.
Since getting back into mountain biking I now lift 2-3 times a week for 75 minutes, my goal has changed to maintaining a base level of strength (probably 80% of my all time maxes) and more importantly mobility to reduce the chance of injury from biking/skiing. I sit at a desk all the time and had a back injury in the past so hip mobility/strength is critical to avoiding pain.
If I didn't have a job I would love to train olympic weightlifting 4-5 sessions a week plus ride bikes and ski. Just need to win the lottery :)