From an actual Whirlpool wiring diagram, Whirlpool seems to allow for 41 minutes of max motor run time and 36 minutes of max heater run time on a normal auto cycle:

I'm now going to have to time the on and off heater periods on my dryer set to medium without any load to determine the ratio in order to get an equivalent run time for the dryer rack.

I'm now going to have to time the on and off heater periods on my dryer set to medium without any load to determine the ratio in order to get an equivalent run time for the dryer rack.