A company has a product family that consists of 2 different models of a product, Model 61-5K and Model 43-7Y. The monthly demand for Model 61- 5K is 1800 and the monthly demand for Model 43-7Y is 1800. Assume a 20 day month. One 8 hour shift is worked, 5 days a week. There is a 30 minute lunch break and two 15 minute breaks each day. The per piece processing time is 120 seconds. The uptime is 96%. If the company wishes to produce every product every day, how much time is available for change overs?