I would be very surprised by this expectation in a public K, given that you say they only have a week's time. In DD's public K, the K kids did a play, but they rehearsed for weeks, and no one had a speech that long. Couple of lines at time, here and there. They also sang songs all together, but if you flub the words doing that, it doesn't matter. But maybe they are all reciting this as one? Have you asked?

No idea what is asked in private schools, though.