The battery life of a vibrating bullet can vary depending on factors such as the intensity of use and the quality of the batteries. Generally, a bullet vibrator powered by disposable batteries can last anywhere from a few hours to several weeks, depending on usage patterns. Rechargeable bullet vibrators have longer battery life and can be conveniently charged via USB or a dedicated charging dock. It's a good idea to keep spare batteries on hand or consider investing in a rechargeable bullet vibrator to ensure uninterrupted pleasure.