4 to 5 hours i don't really know for sure but every time i put it on 1 hour sleep timer and its fully charged 1 bar is off so u can run a test take a stop watch have it fully charged and wait or if u don't wanna wait record the mp3 and watch the finished results.
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a long time
A few minutes
My guess would be about 9 trillion D batteries.
approximately 162 years
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