53:56 The following data is available for Vaughn Repair Shop for 2019: Repair technicians' wages $300000 Fringe benefits 90000 Overhead 70000 Total $460000 The desired profit margin is $48 per labor hour. The material loading charge is 40% of invoice cost. It is estimated that 5000 labor hours will be worked in 2019. In January 2019. Vaughn repairs a bicycle that uses parts of $120. Its material loading charge on this repair would be 548 $72 5140 5236