Did a little test on a road course oil pan like the one I installed. When I filled the pickup area to the top with old oil it took about 10 minutes for the oil to escape past the trap doors and exit the pan though the oil drain plug.
In addition the same area I tested continued to hold about 1/2 to 3/4 of a quart after it finished draining
For oil changes I recommend the motor be warm and jack up the car as much as possible to aid the oil draining towards the oil plug. Most important is to let the oil drain as long as possible (more than 10 minutes) with the trap door style pans.
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