What is the duty cycle rating for the XMT 304?

The XMT 304 is rated at 300A at 32 Volts DC at 60% duty cycle. Duty cycle is the percentage of a 10-minute period that the unit can weld at rated load without overheating. If the unit overheats, output stops, a Help message is displayed, and the cooling fan runs — you should wait fifteen minutes for the unit to cool and reduce amperage or duty cycle before welding again. (Page 13)