Consider a four-step serial process with processing times given in the following list. There is one machine at each step of the process, and this is a machine-paced process. The plant runs a 24/7 schedule.

• Step 1: 27 minutes per unit
• Step 2: 6 minutes per unit
• Step 3: 28 minutes per unit
• Step 4: 20 minutes per unit

Assuming that the process starts out empty, how long will it take (in hours) to complete a batch of 88 units? (Do not round intermediate calculations. Round your answer to nearest hour.)