The size of the aircraft fraction or share depends on the number of hours you need to fly per year. In terms of annual flying hours this is: 1/16 share = 50 hours (250 hours over 5 years). 1/8 share = 100 hours (500 hours over 5 years). 1/4 share = 200 hours (1,000 hours over 5 years).1/2 share = 400 hours (2,000 hours over 5 years). Full share = 800 hours (4,000 hours over 5 years). A âfull shareâ is considered to be 800 hours per year and equal in cost to the full retail price of the plane./2 share = 400 hours (2,000 hours over 5 years). Full share = 800 hours (4,000 hours over 5 years). A âfull shareâ is considered to be 800 hours per year and equal in cost to the full retail price of the plane.