It means that you are never lalowed to park there; that is a no parking zone.
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That means take it every 6 hours. 24 hours in a day, divided by 4 is 6.
If you mean as in 24 hours then it is equivalent to 21/125 of a day
3 hours is 1/8 of a full day. 3 hours divided by 24 (hours in a day) = 3/24 = 1/8 (This could vary with the number of hours in the "day" you are considering: a full day, day as opposed to night, or a work day.)
12 hours*21 days=252 hours
24 hours a day