How long do you cook soup on a 650w microwave?

You cannot cook soup in a microwave oven. Microwaves are designed to heat food through the process of dielectric heating, where water molecules vibrate rapidly and generate heat.

Soup, being a liquid, would simply boil and potentially splatter within the microwave.

To cook soup, you need a stovetop, oven, or slow cooker.

Please let me know if you have any other questions about cooking methods.