How Long does it tale for an apple Watch Series 7 to charge with fast charge?

According to About fast charge on Apple Watch:

"With fast charge, Apple Watch Series 8 and Apple Watch Series 7 battery level can go from 0 percent to 80 percent in about 45 minutes. Apple Watch Ultra battery level can go from 0 percent to 80 percent in about an hour.*"

Anecdotally, in my experience from 50-100% in one hour.

My experience is about the same as Fert II's. My Watch is usually somewhere around 50% when I wake up. If I leave it on the charger while I'm showering and dressing, it's close to or at 100% in 45 minutes.