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LOL, how did you figure that number out, don't tell me you sat there and counted?
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i bet he used a tachometer and figured the revolutions per hour, then multiplied that by an estimated average hour per day usage, multiple by months, years etc.
if he timed his RPM's at 300 all he would need to do is measure the first minute. multiply 300 times lets say 60 minutes for RPH per day = 18,000RPH times lets say 8 hours = 144,000RPD
and if he did this every day 144,000* 364 = 52,416,000
and with his revolutions 52,416,000/27,000,000= 1.94years.
rough guess.