I wonder why that's not supported by Biscuit despite dozens of other functions being present. E.g. download and display an image once an hour. Can't wake from sleep regularly?
Maybe they've just not thought about that (yet). It looks to be mostly coded by Claude so, presumably, it been a very quick project to take from zero to where it is now, and they're in the mode of throwing old socks at the wall.
https://blog.4dcu.be/diy/2020/10/04/PythonKindleDashboard_2.... ... look just above this link (search for `rtc`) and see some extra stuff here: https://github.com/mattzzw/kindle-clock/blob/master/kindle-c...
other devices may / may-not have RTC clocks or "easy" access to longer-term RTC-style running.