X-37B mission durations

Thanks to Ted Molczan (Fri, 17 Oct 2014) for plotting the mean altitude vs
mission elapsed time of all three OTV flights (
http://satobs.org/seesat_ref/misc/X-37B_OTV_1,2,3_mean_altitude_history.pdf
).

Is it significant that the second and third flights' durations (468 and 674
days, respectively) are almost perfect multiples of the first flight's
duration (224 days)? The even divisor would be about 228 days.
Any bets that the next X-37B mission will last 911 days?
If so, any ideas why?
Has this already been discussed and resolved elsewhere?

John Charles
Houston, Texas
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