half-time and bands

[oc]

Help me out please. I am a new AD and have a disagreement between my band and the officials.
What is the NFHS rule for half-times and how much time the bands/cheerleaders can use?
Is this followed strictly or can it change state by state, conference by conference?

What if both the home and visiting band wish to perform? What is protocal? Can both perform at halftime, or is one before the game, etc, etc.

-I have no idea, I am a basketball ref and former basketball coach. I don't know the football rules but reading a bit posted here it looks like the rule is 12/3 but could be 17/3 if the state chooses? How strict are you with those times?

thanks