In the hangar: In the game:
25% =13 minutes 25% = 12 minutes
50% = 27 minutes 50% = 24 minutes
75% = 40 minutes 75% = 40 minutes
100% = 54 minutes 100% = 54 minutes
Obviously, the 1 minute difference at 25% is not a big deal, though still an error. At 50%, the 24 becomes 23 right after takeoff, so the difference is significant.
And if the in-game values are correct, what explains the 16 minute jump from 50% to 75% when the other 25% increments yield 12-14 minutes?
Each increment should be identical in any case. Something is not right.