a little update:
its running now stable sincs several days with 13 2min wakeups per day.
I am relying on the battery-percentage values of the kobo and the consumption of the mode "mem" (suspend-to-ram) seems to be ~3,5% per day.
this would give a runtime of around 1 month on a single charge.
I want to test the disk-mode next to see if it brings more value...
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