Midco's executives have decided that, considering the business environment, the current expected duration of the project is not competitive. They want to ensure that the probability of completing the project in 8 months (240 days) is at least 80%. By how many days should the expected project duration be shortened? Assume crashing actions do not impact the variance of the activity durations. Expected project duartion is 376.34 days. the z-scoe is .84