How long should this be cooked in the microwave?

I got a mini pizza from the campus store. We're not allowed to have stoves or anything in our dorms, but all dorms do have microwave ovens. However, the instructions on the package are only for conventional ovens and toaster ovens. Both at 425 degrees for around 10 minutes (not including thawing or crust softening). What is the proper way to cook this in the microwave?