So I've been fiddling about a bit more, using the "switch everything off, and I mean everything" strategy.
Starting point for Partial Wake time -
Android System = 50%
Everything else = negligible
Change Hero so that:
All data / network connectivity - off
Every widget and link on the home screens - removed
APNs disabled with APNdroid
And reboot and play around enabling disabling widgets.
And I think I've narrowed it down to two widgets which look innocuous: Clock and Calendar.
Clock - I had this on centre home screen, running in the "Number" rather than "ClockFace" option (time in digits, takes up two screen tiles, optional location+weather) with no location/weather updates.
Calendar - had this on Left-1 home screen taking up the whole screen, no weather updates.
So now I have falling % total wake time, and crucially partial wake against Android System is 'stuck' at 12 seconds after 2 hours since boot.
I'll keep this updated.
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