Smartwatch always on - well maybe if the wind is right

I have an LG G Watch R that i have had for some time and i have been thinking of upgrading. But one thing has bugged me for over a year. Don't know if its a bug or an ehem feature but the Always On mode, simply isnt. When i first factory reset the watch it seems to stay always on for days, but then for no reason i can figure out starts turning off the screen.

Are there any "true" always on recent smartwatches that actually DO stay on?

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