Two.
Or three.
Depends on where the first one occurs in the period of ten years, and what you reckon ten years is.
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There were 10 leap years between 1970 and 2011.
there will be 105,168 hours
5,258,880 minutes.
It's not really a decade if you exclude leap years, but 365 x 10 = 3650.
16 leap years