We have an XD490U projector. The bulb life warning came on so we ordered a new bulb. The bulb lasted about 12 days, then stopped working. According to the indicator lights, the bulb needs to be replaced again. We put the old bulb back in and it works. How much time do we have on the old bulb once the warning shows up? We are having a party in a few days and we now have to use the old bulb because the new one was a dud.