31 - 24 = 7
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To today (24th December 2013) there have been 22280 days since 24th December 1952
There are 1/24th (or .04166666666666666666666666666667 days) in one hour.
There are 2,678,400 seconds in 31 days.
If by "only 31 days" you mean "exactly 31 days", then 7. If by "only 31 days" you mean "not more than 31 days" then all of them.
There are 31 days in August.