Around 15 minutes. I was lapping at an avg of 9 sec per lap but my track is more technical than the one we are going to use. This weekend I am going to put it up the ISC track (have you named it?). If the lapping time is less (track is shorted and there are longer straights) then 100 laps might take less than 15 minutes. This of course with Hard tyres: using soft ones we can lap for only 50 laps.