It can be done in under 2 minutes.
Don't believe me? Try this. Take a cup and fill it 1/2 full with water. Add a couple tablespoons of lemon juice. Use your microwave's "beverage" setting or run the micro for 2-3 minutes on high. The point is to cause steam to build in the micro from the water/lemon juice concoction.
Remove cup. If you have a turny-thingy, take it out and put it in the sink. Wipe your microwave down. 2 minutes tops to clean it out. Even when completely filthy. And now it's lemony fresh instead of smelling of chile or burnt popcorn.
Wipe down the turny-thingy and return it (put it back correctly or your micro will make Exorcist like noises).
Apparently I'm feeling helpful today.