Great question — answering as the UphillTech team:
Any programs that follow the US Amateur Basketball National Rules : The National High School Federation Rules and Regulations (NHSF) will apply to all US Amateur Basketball games with the following exceptions. ... Middle and High School (Grades 7 thru 12) will consist of two sixteen minute halves and will use a regulation size basketball (intermediate size ball for Women). Grades 3 thru 6 will consist of two fourteen minute halves and will use the 28.5 intermediate size ball.
Full answer by CGCampbell: https://sports.stackexchange.com/a/26373 (CC BY-SA 4.0).
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