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.

Step 1: 16 minutes per unit

Step 2: 15 minutes per unit

Step 3: 22 minutes per unit

Step 4: 12 minutes per unit

Assuming that the process starts out empty, how long will it take (in hours) to complete a batch of 98 units?

Note: Do not round intermediate calculations. Round your answer to nearest hour.