An open side planer is to be used to plane the top surface of a rectangular workpart, 25.0 in. x 40.0 in. The cutting speed is 30 ft/min, the feed is 0.015 in/pass, and the depth of cut is 0.250 in. The length of the stroke across the work must be set up so that 10 in. are allowed at both the beginning and end of the stroke for approach and overtravel. The return stroke, including an allowance for acceleration and deceleration, takes 60% of the time for the forward stroke. The workpart is made of carbon steel with a tensile strength of 50,000 lb/in^2 and a Brinell hardness of 110 HB.
How long will it take to complete the job, assuming that the part is oriented in such a way as to minimize the time?

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