What are the duty cycle ratings for the Millermatic 211 Auto Set?

The 120VAC model is rated at 90A at 20 Volts DC with a 20% duty cycle, meaning it can weld for 2 minutes then requires an 8-minute rest. The 230VAC model is rated at 150A at 23.5 Volts DC with a 30% duty cycle at 60Hz, allowing 3 minutes of welding followed by a 7-minute pause. Exceeding the duty cycle can damage the unit and void the warranty. (Page 8)