Source1: https://www.anylogic.com/resources/case-studies/military-aircraft-maintenance-scheduling-and-staffing-optimization/#:~:text=Among%20other%20duties%2C%20engineers%20maintain,cover%20one%20hour%20of%20flying.

Source 2 (10 weeks * 5 days * 8 hours * 4 engineers = 1600 hours per 480 flying hours) : https://www.businessinsider.com/us-army-soldiers-take-black-hawk-helicopters-apart-for-maintenance-2019-11#its-a-great-opportunity-for-delta-company-during-the-kfor-26-rotation-to-be-able-to-get-hands-on-experience-strella-said-2