Well, I’m playing Devil’s advocate here (hopefully not literally), IF it is actually decided that reasonable accommodations legally MUST be made for religious purposes. I think the time I and other children, including Protestants, Catholics and Jews, were given to attend the Chapel on Wheels in the early 1960’s was reasonable, but it’s now banned. So I see no reason this special time is given for Muslims. The fact that other kids gets the time out to do what they please is beside the point.
So, again, IF the high court determines that this mandate for daily prayer be accommodated, then it would be better to tell the kids you've got the lunchtime break and a lengthened afternoon recess to get ‘er done.