How long do I have to microwave my phone for to dry it after dropping it in the toilet?

I recently dropped my cell phone in the toilet and it became totally soaked. My great grandmother suggested microwaving it How long must i leave it in the microwave before it will work again? I tried 5 minutes, and it began to smoke so i know it must be close to being dry...but it still doenst work. Help?
Update: Its been 30 minutes now...it smell a bit funny, but I think its working
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