For watches with charging pucks that have 2-pins (the charging puck is what came with a USB cord and attaches to the back of your watch), most USB wall adapters with a minimum rating of 5V 500mA will typically charge your watch from 0-80% in about 1 hour.
For watches with charging pucks that have 4-pins (the charging puck is what came with a USB cord and attaches to the back of your watch), most USB wall adapters with a minimum rating of 5V 1A will typically charge your watch from 0-80% in about 30 minutes. a. For fastest charging speeds, only the 4-pin charging cable and puck that came with your watch should be used. Third party charging cables cannot be guaranteed to provide fast charging.