Pops,
y.a.: >> ...what is the most you have cleaned at one session? <<
20 -30 max. I know when my legs start to buckle that I give it a rest.
It's why I do not feel bad about having only found 3-5 second-hand items, since its enough cleaning at a time.
Mind you, I'm also anal about those ragged record edges and HAVE TO have them cleaned up, smoothed over -- which I do during the scrubbing cycles :-)
Greetings,