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On the tablet I tried, you could disable sleep mode... Don't know about the file format. Do you really spend hours at time looking at the very same page without interruption? I used to play a lot but I would never have spent more than 30 minutes on a half page (a page on a tablet is about a half page) without a break or throwing the score away in disgust.
I also assume you will only use your device indoors and probably plugged in too. You might want to take a look at the cable possibilities. Mine would never go from a piano stand to an outlet...
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