How fast are thrusters?

Could you elaborate on the concept of "thrusters" and the context in which you're asking about their speed? Thrusters are often associated with spacecraft and propulsion systems, where they generate thrust to propel the vehicle. The speed of thrusters can vary significantly depending on their design, power source, and intended purpose. Are you referring to the rate at which they can accelerate a spacecraft, or perhaps the velocity they can achieve when fully operational? Additionally, is there a specific type of thruster you have in mind, such as chemical, electric, or nuclear thrusters? Providing more context would help me to provide a more accurate and informative answer.