The Apple Watch S7\/S8 can charge from 0% to 80% in about 45 minutes.
The Apple Watch Ultra, which has a larger battery, takes longer, charging from 0% to 80% in about an hour.
However, it should be noted that to achieve this \"fast charging\" requires the use of a separate USB-C magnetic fast charging cable, and the base is replaced with an aluminum alloy shell, which is priced at 283 yuan (one meter).
The average iwatch charge takes 2.5 hours from zero to full charge.