Cooking Sweet Potatos in the Microwave
Assuming a typical 1200 W to 1400 W microwave

For gold (skin and interior) sweet potato around 4 to 5 minutes per 300 g (large first size)

For purple (skin, and cream interior) sweet potato around 5 to 6 minutes per 300 g

Allow at least a minute sitting time before cutting or serving to allow for an even cook