In Wisconsin, it is both allowed an encouraged to take extra breaks. I aim for the middle of the quarter, but only after a change of possession so as to not break momentum of the game.
One high school player has already died this year during practice in the heat (it happened on 7/31 or 8/1 down south).
And for those who are snickering - it does get hot in Wisconsin!!!! Today, upper 90s with high humidity - and that's along Lake Michigan. And no, we don't take extra breaks to warm up late in the season!