I have a garmin enduro 2 that I got for under $500 with some discounts. When tracking activities with GPS it lasts for over 100 hours, closer to 150 if you’re benefiting from some solar charging. In normal smartwatch mode it gets up to 40 days.

I’ll randomly once a month remember to charge it and that’s enough. I’ve never had the battery dip below 27 days remaining.

My old garmin was a forerunner 945 and I could about two days of hiking in on a charge, maybe more with battery-saving stuff on, but this is a whole different ballpark now.