Iphone Water Damage

I was in the bathroom and my Iphone 5s fell into the toilet. I took it out as soon as i could and turned it off straight away, but i wanted to check the phone and turned it on but couldnt turn it back off because the screen turned off then i kept shaking the phone to get some of the water out, then it took me about 30 minutes to find rice. I took out the sim card and put it in a bag of rice and tied it. Its been in the bag for about 30 minutes now and im wondering since i couldnt turn the phone off will it stop my phone from drying. And how long should i leave my phone in the bag for?