Wow… Was thinking about you… Searching for this to ask for sit rep:-)… Looks like it’s a winner
Everything is turned off - BT, Wi-Fi, GPS, Google, steps, heart and it’s in aeroplane mode… but I do wear it and look at the time 
I’ve just checked my KW88… I took it off charge at the same time as my D5… the same things are turned of BUT I’m not wearing it (it has no watch faces!)… it says 78% 15hrs left…
D5 - 66% after 2d 10h 37m 44s
KW88 - 50% 1d 19h left
About 6:00am
D5 - 54% after 2d 22h 01m 56s (upload a new face via wifi)
KW88 - 48% approx. 2 days left
About 5:30am
D5 - 47% after 3d 9hr 18m 19s
KW88 - 39% and 1d 16hr left
About 8:00am
D5 - 38% after 4d 0h 5m 1s
KW88 - had run out of battery (so yesterday’s 1d 16hr left was wrong by about half a day!)
Nice job!
Now we know how far the battery gets the KW88 when only being used as watch.
About 5:15am
D5 - 25% after 4d 21hr 10m 42s