Samsung Galaxy Watch from years ago, still running Tizen. Got it as a company Christmas present, so I'm not too fussed about the mediocre battery life. From what I can tell the Garmin models in the same price range don't last much longer either.

If it makes you feel any better, I've got a perhaps Galaxy Watch 7 from almost a year ago or so running wearOS, and it's battery life is at best at the 36 hour mark regardless. Came from an older tizen-based watch with similar battery life, and at least wearOS is far more funtional.

I wear Huawei WatchFit during sleep, battery also lasts over a week. I didn't know Apple Watch batteries are that bad.

I dare you to sniff it