How long does it take to get from Cairo to Giza on a boat in the Nile River?

Giza is right on the border of Cairo - it practically is in Cairo, right o the southern end of the Nile Delta on the Western shore. And the river no longer runs next to Giza as it did in ancient times. But it is not far from the Nile's shore to the Giza plateau. Definitely within walking distance.