In case someone is interested, I think this is the Beethoven's 5th by Gould about which MPI is talking about
http://youtu.be/jh8q6CfhjtI
If the story explaining how Gould got to play this concert is true, that's a hell of a performance. It would be too if the story wasn't true
I'd wait more than 36 hours, I don't think all the humidity can be removed from the insides by the rice in such a sort term. It's a pity one can't easily remove the battery from an iPhone.
Shelly, get a SPL meter or install an App in your phone to measure the noise levels the dryer produces. I think anything under 50 or even 60 dB at 1 meter would be acceptable, but you may check with the manufacturer if it's OK.