The ride was a lot longer than fifteen minutes, but that have been because I was too scared to go over 25km/hour.
But we got there. And were instantly greeted by someone, that for the bargain price of 20 000 MGA each ($10 USD) he would take us around the entire island, stop off at a hotel to see lemurs, and stop on various beaches for a swim. We were sold.
Last year in Okavanga Delta, I rode in a fiberglass "pretend" pirogue. This one was much funner.