I did Commercial Flooring. So a SMALL job was usually around 10,000 Sq. Ft.
One of the largest was 250,000+ Sq. Ft.
At 64+ years old my body just can't do it any longer.
It's not my knees that can't handle it. I've used ProKnees for over 20 years and those things CAN NOT be beat! Still have and use the 1st pair I ever bought.
Not a bad investment for around $150 20 years ago!
I also did demolition work for the same Company in between the flooring.