in my area, JV and Varsity are 8 minute halves. 7/8 grade games are either 6 or 7 minutes, upon agreement between coaches usually, Freshmen games are 7 minutes.
Halftime, always 10 minutes around here. Most players won't see 15 until they get to play at the college level, if they do.
OT is ALWAYS half of regular period duration.
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