two 20 minutes halves ... overtime periods are five minutes.
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there are 4 quarters. in professional Basketball, each quarter is 12 minutes long
There are four 12 minute quarters in the NBA. Two twenty minute halves in USA collage, and four ten minute quarters in high school. Eight minute halves in Elementary.
There are four quarters in a regulation basketball game ranging from 8 to 12 minutes depending on the age group.