It's a tough call as to whether or not Honda was mixing or not (I personally think that she was), but if we are simply turning this into a "who sang the longest recorded money note" thread, then the aforementioned clip of Minako Honda singing "Tsubasa" might very well be it. She holds it for nearly thirty seconds.
Other performers who have the ability to sustain "belted" notes for ridiculously long periods of time include Darius De Haas, Michael Arden, and Stephen Pasquale.
"Goodness is rewarded. Hope is guaranteed. Laughter builds strong bones. Right will intercede. Things you've said I often find I need, indeed. I see the world through your eyes. What's black and white is colorized. The knowledge you most dearly prized I'm eager to employ. You said that life has infinite joys."