60 minutes per hour.
Each day is technically only 23 hours and 59 minutes, So if you do the math each hour consists of a little less than 60 minutes, but the number is only off by a very small amount that there is no reason why we cannot just round the number to an even 60 minutes. But this is why every four years we have a leap year, adding February 29th to the calendar; all the minutes from each day from the previous four years add up to make a whole extra day.
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If you mean of an hour then 0.25 of an hour is 15 minutes
1 hour = 60 minutes 1/12 hour = 60/12 minutes = 5 minutes.
1 hour = 60 minutes 0.4 hour = 60 x 0.4 = 24 minutes
1/12 hour = 5 minutes
20 minutes.