24 m = 80 feet. Ok, just an estimate. But it is a big piece of something.
He also said it was "awash". If so, the drift will be largely based on current rather than current and wind. Will help a bit estimating backtrack.
2 hours overhead only. AC sequenced to maintain continuous coverage for the rest of today. They are doing best they can do with limited assets at long range.
He also said it was a bit south of search area. That Chinese ship was also to the south I believe.