After a full charge, the guitar can be used for at least 10 hours.Fast Charging: 3-4 hours Slow Charging: 7-8 hoursWe do not provide a fast-charging adapter, so users will need to purchase one themselves. We recommend using an adapter with a power output of at least 20W.Charging Indicator: Slow Charging: The indicator light is orange. Fast Charging: The first two lights are red, and lights 3 to 12 are green. This indicator helps users distinguish between fast and slow charging.