Maybe it wasn't that long then... It was really hot outside, I guess I'll keep track of how long it stays on next time. Thinking about it, that does seem a bit long. It usually came on while I let it idle after clearing an obstacle, and I was usually out of my Jeep playing spotter in that situation. I'll keep an eye (or ear) on it next time I'm on the trail, my e-fan has never kicked on during normal driving / traffic, so my cooling system can't be all that bad.