Yоu аre trаnspоrting а neоnate on NC at 1 lpm to a level III nursery 30 miles away. The ambulance oxygen source was depleted due to a leak and you must now obtain an oxygen E cylinder for transport. You anticipate the drive to take 40 minutes. You obtain an E cylinder with an oxygen gas reading of 1700 psi. How long will it last in hours when in use for this transport?