There is a rule in NCAA which says if the offense does make personnel changes then the defense is given a reasonable time to make their own subs. The general consensus is they have 3 seconds to react and 10 seconds to complete their substitution. Thus, if the offense suddenly switches several players with less than 10 seconds on the play clock and the defense begins to make substitutions and cannot complete it before the clock runs out, then the offense is hit with a delay. In NCAA you cannot break the offensive huddle with 12 or more.
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