thank you for the discussion, folks!
The issue is comming from my TRI.
He thinks at MLW, that LDA is an ordeal for A342/3 and...too short for B744 (sorry B744 guys, that's why I make mention of him
)
He told me that kind of LDA was able to lead brakes temp, to high temp. (Average OAT of airfield is 30°c) which isn't the case with b772.
Thus to affect LD, and beside the turn around time.