Santisima Trinidad's repairs before the storm

When did the Royal Navy realize Santisima Trinidad would never make Gibraltar before the post-Trafalgar storm?

Very late; carpenters continued trying to save the ship almost until the storm struck.

Carpenters continued working on Santisima Trinidad almost until the storm struck. They were still trying to make the captured ship fit to reach Gibraltar. The effort continued very late, without a precise decision time being given.