I know I don't weld as hard as the professionals but I can't remember ever exceeding my duty cycle. My lil Blue Star Jr. is a tank. It says only 60% @90a but I know it runs hotter than its max 100a and have definitely exceeded the 6 min on "MAX". Haven't seen the light on my mm211 either. Anyway I know most of you guys probably have,I'm just throwing the topic out there.