I would like to know however how bad was the wing inner structure (regarding spars and ribs) affected and could have it been critical if e.g. the crew computed a landing distance that required to stay even longer airborne in order to burn more fuel to reduce the landing weight ?
Length of time airborne would not affect failure unless wing burning, once damage established...
In fact perhaps more fuel burnt would though, increase chance of a gust load exceeding compromised structural strength. Landing -ve loads of course another matter