Seventeen minutes sounds like a LONG time - especially if they've practiced the maneuver before. The announcer said they were in 8m (24') seas, which seems unlikely from what we saw in the video. We don't know what sails they had up, or what their drill is supposed to be. It would be good to know more before turning into Monday morning quarterbacks.
Being unhitched while going on and off watch IS dangerous. A member of our club was knocked overboard one night by the main boom in a surprise gybe while he came up the main hatchway. They never found him.