The time it takes to bake potato slices in an air fryer is roughly between 20 and 30 minutes, which may be adjusted depending on the thickness of the slices and the desired degree of doneness. Here are two common practices summarized from the information provided:

1. Soak the potato slices in water for fifteen minutes, wipe off excess water, put oil in and mix well, then put them in the air fryer, set the temperature at 190 degrees and bake for 20 minutes. You will need to turn them over once during the baking process to ensure even heating.

2, another practice is to put the potato slices into the air fryer, sprinkle salt, cumin powder, chili powder and other seasonings, set the temperature to 180 degrees, bake for 10 minutes, flip and then sprinkle the same seasoning, continue to bake at 180 degrees for 10 minutes.