Eight hours. Vibration slimming machine, as its name implies, promotes body fat burning by vibrating muscles, but it is actually a passive exercise, and the body is not prepared and accepted, which is easy to cause skeletal muscle damage. It can be used continuously for 8 hours on a single charge. It is recommended to keep it for 30 minutes at a time to avoid harm to the body. When using, the frequency of shaking is not well grasped, and strong shaking will make the internal organs shake together, causing certain damage.