10 hours is definitely not normal for a Forma, (at least, with light below 50%). But be sure the device has been left to charge for a good 8 hours to be properly "Fully" charged. And a complete shutdown, (not sleep, you have to hold the power button for a few seconds for a shutdown) is a good idea, in case some background process got stuck and is grinding the processor.
Edit: I was assuming you mean 10 hours in a 1 or 2 day span, but you didn'tt actually say. If this is over a couple weeks, that might be quite normal)
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