I also thought about one thing. It might sound controversial and against common sense, but my scientific research experience gifted me many nice revelations this way
So now you have:
— Enter Kindle to sleep
— Draw current time, send to sleep
— After t<60 s, wake up, draw another time, send to sleep
— repeat until terminated.
I am thinking, what are the wake up routines that Kindle goes through? Are they more power hungry at startup compared to other processes running during wake up over a specific time interval? Maybe right now it is not
that energy-efficient to put them to sleep and wake up every minute?
How about doing a proper wake not every single minute, but once a 3-minute (5, 10, etc) interval?
P. S. I can also take part in the long-term testing routines if you don’t mind
During weekdays there are 2-3 days when I have no time to touch my Kindle, so I can run, let’s say, a 24-hour test and report. Then you can collect all such data (routine type and its time) to see how they compare one to another.