I have a Garmin Instinct Tactical Solar. 30 days on a single charge!
Discussion
That's cool. I use Fitbit Charge 6 now, it's small, minimalist, battery lasts up to 10 days. The sleep recording seems to be often flakey but it's enough OK for me. What's appealing is sleep phases. However, I frequently have impression that this feature is a bit hit and miss. Also unexpected updates like in Windows. 😉
My previous was also Garmin. Something put me off it. Barely remember the main problem, it could be some stupid design issue. Apart of that the strap used to cause eczema. 🙃
I might have another look into it. At the time it looked really crazy but now is somewhat intriguing.
I still go back and forth between the Garmin and an analog watch. I've made the Garmin as "un-smart" as possible, no notifications other than if my wife or kids call me. TBH - I'm leaning toward a non-digital watch more and more, as I have some nice ones. Here's my Garmin 
