OK, before my TT, I would sit in my car for a couple on minutes before I shut down. Now, I've been monitoring my TT, the cool down is usually about 30 sec. My TT is set to a minimum cool down of 20 sec. and it builds from there. My TT monitors my boost and my RPMs to calculate the time needed for cool down. Keep in mind, when you are at stop lights or in traffic, cooling is happening. I've watched my time build as I'm boostin and I've watched my time decrease as I am idling at a stop light. Hope this helps!!