Wow, nine aircraft in ten days?
Probably these guys flew quite a lot during those days, let's take a guess and say 3 to 5 sorties per day (depending on distances/time flown), this gives us nine "busted" engines for 30 to 50 sorties total for these 10 days.
Now, divide the amount of engines used up by the sorties and you get a per-sortie engine failure rate of 18% to 30% for going above the limits. In other words, almost one in five to one in three sorties results in a busted engine, not exactly a trivial risk.
Pretty interesting reference there to get a feel of how easy it was to break an engine under operational conditions, thanks for linking it.
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