You can choose when M92 goes to sleep and when switch off in menu.
In current version you can choose only from several combinations. You cannot set your own times for sleep/off.
You can choose that it does not go at sleep mode or off at all. That is the mode I use. I might read the page for an hour sometimes...
Generaly I do not switch it off, only make it sleep (in most cases). I do not think it consumes much energy. I charge it once a week (maybe even less frequently), or so...
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