Here's an example with Roma Tomatoes:
Day 4: The tomatoes no longer bend, they break. Now they're ready for the bins.
For larger round tomatoes I slice them between 3/8" and 1/2 inch, lay them on the rack and let them go 4-5 days--until crisp.
I cut apples between 3/8" and 1/2" thick for drying, dip them in a mix of apple cider vinegar and sugar, then dry for 4-5 days--until they are crisp.
Here's a shelf of green peppers. These were quartered from top to bottom and then dried for 3 days.