Incredible Facts About the B-2 Spirit 24. In 1997, each hour of B-2 flight required 119 hours of maintenance. Comparatively, the B-52 and the B-1B require 53 and 60 hours respectively for each hour of flight. Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
