Workout length?

[Benq123]

It's not mentioned on TMO but I've seen some guys touch on it in some posts, so was just wondering the general opinion on length of workouts and does it matter? Mostly regarding avoiding excessive cortisol therefore less testosterone. I personally try to stay around 1 hour, sometimes it may go a little longer like 1:15.
Also I assume this doesn't include the warmup etc, but what about less demanding things like calf raises at the end of a workout. And what about setting up for a new exercise lol, how does that factor into your time at the gym.
Hope this makes sense, I'm pretty tired today so forgive me, but would love to hear your opinions on this.