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eight days is a good mark.
I've run a clock app on a kobo aura hd the last two/three? years: the app:
does a partial update of the clock area each minute (obvious, but...)
does a full refresh of the clock area each 15 minutes
connects to wifi and retrieves weather each hour.
has the light button repurposed as a snooze button, to light the screen a few seconds and see the data.
I don't use rtcwake, just leave the processor idle (with conservative governor). I got about 48 hours of autonomy without using the light.
In the past I did a few things to improve battery life:
use a ramdisk for the rootfs instead of a block device
remove kernel options that I don't need
reduce the frontlight level while snoozing.
I had fun but I probably didn't squeeze more than a few minutes per cycle, so meh.
I don't have a kindle (or much kindle inner knowledge) but I guess you can stop any running services/frameworks and see if that makes any difference.
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