I tested out Pixel 3 (or 4 .. i don't remember at this point). The 30 hours is when you have all the functionality enabled all the time. Like the always on display, always on notifications etc ...

I used to auto set the watch into DnD / battery saving mode at night, and used the "raise hand to turn on the display" functionality.. I used to get 3-4 days of continuous use.

Charging used to be like "put the watch into charger after waking up. It'll be ready by the time you get ready for office".

I did miss the 30 day battery life of my Amazfit bip and 2 week battery life of Pebble before that.. but charging once a week wasn't all that bad...

But again, I mostly used my Pixel watch as a fitness tracker. Didn't really care for most of the apps - except maps.

I have all the features enabled on my Garmin watch (vivoactive 5), including always-on display, and still get at least 4-5 days of battery.