100% of my progress has come during period where I benched 3x per week, plus upper back, and squatted 2-3 times per week, but if you eliminate warmups, ramp-up sets, set up, and rest between exercises, I only did a maximum of about 10 minutes of main pressing+10 minutes of a secondary bench press exercise, 10 minutes for upper back, 10 minutes of squatting and 10 minutes of deadlifting or a squat assistance exercise. That is time working with rest periods after hitting my first real work set, so 30 minutes 3x for benching/rows and 20 minutes 2-3x per week for squats+deads or assistance.
I might have spend at most about double that time in the gym.
Example, M, W, F: 5 minutes warmup, 10 minutes ramping up with 1-3 reps, 10 minutes doing 4-8 work sets, 5 min break to assistance for 10 minutes, and 5 min break to rows for 10 minutes (55 minutes)
T, Thurs, Sat: (skipping thursday about half the time): 15 minutes warmup and ramping for squats, 10 minutes of work sets (4-8), maybe 10 minute break, and 10 minutes of work sets on deads or assistance squat. (45 minutes)
And I probably only did a bench assistance, or deads or squat assistance about half the time.
probably an average of 3 1/2 to 4 hours in the gym per week. When I spent more time working out I did a lot of useless stuff, and didn’t get any more big sets, and didn’t make progress.
I took my bench from 320-360 in 4 months by just benching for 10 work minutes 2 times a week, and doing 10 minutes of assistance about half the time.
Main exercises work for me, and I don’t see a point in more than 2 presses, or 2 lower body exercises, plus 1 row.