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The actual rule is KHSAA By-law 25, a portion of which is pasted below

8) Each football school may conduct ten (10) practice periods of
not more than two (2) hours in length and not more than one
practice per day over ten (10) days during the three calendar
school weeks following the school’s elimination from postseason
play in basketball. All equipment authorized by the
football playing rules may be used during this period. There
can be no inter-school competition during this period, and all
participants must be eligible according to all KHSAA eligibility
rules.