During Le Mans night testing, we validate timing equipment under extreme conditions. Authentic Rolex chronographs maintain ±0.05s accuracy at 200km/h, while some fake rolex units showed 3.2s/hour drift - enough to miscalculate pit stops by 43 meters. This variance directly impacts fuel strategy; our data shows replica movements overheat in gearbox vibration frequencies above 120Hz, compromising chronometric precision during critical overtaking zones.