Does this mean that once you begin working on a specific muscle, you have to "tear the fiber" within one hour and all work after is for nothing?

This cracked me up.
Honestly, I think 70 minutes is too short for me to complete all I want to do. And I don't chat and pose at the gym.
That'll take like 2 1/2 hours per day. And I ain't got all that energy.
Is like this good? Day 1: Chest, Tri; Day 2: Back, Shoulder; Day 3: Leg, Bi; Repeat
That's been working well for me, except on leg days where I'm too dead for anything after legs.
Mmm yes, I see. I see...
One other question. Chest is where I'm seeing the most noticeable growth, and I put extra effort there. But I hardly feel the burn there, during and the days after... Normal?