The mines self-destruct after a preset time which can be set to 4 hours, 15 hours or 15 days. Any that do not will become disabled after 40 days when the batteries discharge fully. The self-destruct time is set just prior to aircraft takeoff using a simple selector switch on the dispenser. During the Gulf War the dud rate for this system was significant, in one of seven Kuwaiti battlefield sectors there were 205 BLU-91 and 841 BLU-92 duds. Given that 89,235 BLU-91 and 27,535 BLU-92 mines were used during the Gulf War, this represents a dud rate of somewhere between 0.5 and 2% for the BLU-91 and to 6 to 21% for the BLU-92. Additionally, Conventional Munition Systems Inc. minefield clearing personnel reported dud GATOR mines detonating with no apparent triggering event, and speculated that the extreme heat of the Kuwait desert may have triggered detonation.