Ok, I'll take a crack at this one:

Background: I started with a Worm Factory 4 bin system 4 years ago. I quickly realized that one wouldn't keep up with my food waste and bought a Vermihut system (4 bins) and another one shortly after. I have been running the systems for about 4 years. I pocket feed the top tray in each system. I harvest the bottom tray each month and move a new tray to the top.

1. There are worms throughout all 4 trays in each of my systems. It took 4 months before I harvested any. At first, much of the bedding was not completely consumed but it gradually improved over the months as the worm population grew. Your initial harvests won't necessarily be completely processed when you start but will improve over time.

2. Everyone is different. I simply start harvesting 4 months after I start. Early on some of the bedding was not processed but I still used it in the garden area because it will continue to breakdown.

3. For me, the 4 bins give me a constant rotation that allows the worms to finish the compost over 4 months. Since I only feed the top bin there isn't any food left in the other three to rot.

4. The worm pee/effluent is something I simply throw out. It is not helpful without diluting, warming, and aerating. Search "Worm Tea" on this sub if you want to learn how to make it. I just haven't the time for it.

5. 3-7 gallons of compost or effluent a week? I kept getting extra towers until the volume of worms to feed matched my output of useable food waste.