10-15 series per muscle group in a week for beginners, 20-25 for advanced lifters/bodybuilders. Break that down for every muscle group and find out how many exercises and series you need for each training session. Example Posterior legs: 4x squats, 4x rdl, 4xleg curls. Anterior legs: 4xSquats, 4xleg extension, 4x leg press. So 5 exercises for most leg muscles.

Four with five sets each is enough - but I go four days in a row then rest, and repeat

Yeah, I don’t even lift 5 days a week and I usually do 4-5, prioritizing my compound lifts.

Like two big compound lifts and 3 or 4 accessories. The compound work is very heavy and takes up like 75% of the workout.

Everything hinges on your goals. For general conditioning, or to reacquaint my body with lifting after a long break, I’ll do 3 circuits x 5 movements = 15 total movements. If I’m focused on pure strength, I’ll do just 3 movements (ex: squat, deadlift, finish with farmer walks), with ~90 sec of rest btwn sets. Rippetoe & Kilgore’s “Practical Programming for Strength Training” is a great resource for this stuff.

On deadlift day….one. Others days two or three. 🙏🏼

Depends on your ability to recover

Wow lots of different answers here. Depends entirely on goals I would say. Some of the volume mentioned here is definitely not enough for a lot of muscle growth. I’d just to maintain and not atrophy sure. Also didn’t see much along the way of accessory stuff and mobility which in my book is super super important as we age and frequently neglected…hence why people think it’s normal to just have aches and pains in their 30s and 40s.

As many as you want. As long as your recovery is good and you're not deadly sore all the time, it's not that important how many you do. I tend to go for the 5-7 range, but longer sessions might be up to 10.

Four to six.