The secret to leaving it in rice overnight is not the hygroscopic quality of the rice, but the Asians that come overnight to fix it.
Originally Posted by FirestormX
The efficacy of rice is an oft-toted exaggeration. Rice is hygroscopic, but nothing amazing. It just means that it absorbs moisture from the air.
For drying things, you have two options: get air flowing over it, to get water moving, or place the item in an airtight container for a very long time. This will let the trapped air circulate through, with the water in it, so that the rice can absorb the water from the air, rather than going back to your electronics.
Here's the first result I found on google: