Depending on how much water is inside, it could take a couple days or a couple months. I’d try shaking out as much as possible, and then leave it sealed up for a week with the rice. Plain white rice please, NO Uncle Ben’s!
But like I said, if you already tried turning it on, the damage may be done. It may never come back. Electronics and water don’t mix as water is one of the best electrical connectors there is and there are literally thousands of micro-solder joints and electrical pathways on the circuit board within 1 square inch inside your player. Doesn’t take but half a drop in the wrong place to short it out for good.
