Doug decides to use a turkey fryer to prepare the Thanksgiving turkey. Due to cold weather, he prepares the turkey with the door closed, limiting air exchage (Q) within the 40 m3 garage to 0.2 m3 min-1. If the fryer emits 350 mg min-1 of CO, a conservative chemical, how long does Doug have to open the door before the 800 mg m-3 fatality limit is surpassed? Assume an initial CO level of zero and that any air entering the garage is CO-free.