28 miles
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You're saying - two at each end. The diameter is going to be effected by the inside walls, floor and ceiling that touch the doors.
2 doors, 8 ft. what separates the doors into two? Then say, there's two feet on either side of the doors, now we have twelve ft. by 40?
OR - is there ONE door at each end adding up to two?
1,004.8 roughly, using 3.14 as pi.
3.14 x 8 = 25.12
25.12 X 40 = 1,004.8.
Final answer.