Thanks for that B/B/B.
Should snow or other freezing contamination be falling after the treatment process, the commander needs to asses whether the hold over time is still applicable and then check by visual means, if the wings are clear of contamination.
I'm still not clear though whether the Commander can make that decision from the Flight Deck? On a large aircraft, you can't see the wings visually from up front (unless by camera), can you?