5453, that was probably in the days before various beancounters' money-saving ideas all met together in a wonderful union of engine wear reduction SOPs.
It may be possible that derating PLUS temp assumed takeoff PLUS improved climb all combined to need the maximum concrete available.
I'm glad I retired before I was asked to lob these 3 together in one takeoff, far too many variables and reductions of safety margins.
Even with only 2 of them used IAW SOPs at Taba, my previous and last company managed to exceed the tyre speed limitations one summer season, due to an unforeseen shift in the crosswinds at the time.
It's only a matter of time before this constant pursuit of takeoff using idle thrust will end in tears, but the promoted beancounters will be far from the scene and the company by then.