I'm not really a fan of microwave cooking, but I find that when the weather is very hot, microwave cooking will not heat up your house like a regular oven will... this is a recipe that really turns out well! The microwave cooking time is only estimated depending on the size of your potato slices and the power of your microwave. I use a mandoline to slice mine. This takes less than half the cooking time of a regular oven, and is really a delicious side dish, you can also do this using about 2-1/2 pounds of all russet potatoes, or all sweet potatoes. I also like to sprinkle some Parmesan cheese and caramalized onions that I store in my freezer in between the potatoes when layering, but that is optional.