I use just standby, no off and the battery lasts several weeks I guess. I did not make precise measurements....
I recomend using OTFM filemanager for setting standby and/or off times. It gives more freedom than standard Onyx power management dialog.
I use setting 30 min standby, no off. Longer standby is more pleasani if one studies difficult page. It may také more than 5 min.
It is possible to free your ArtaTech device and install Booxstor's firmware. But you might void the garranty. The needed SW you'll find in this forum, might be even described in Wiki...
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