At the touchdown speed of the aircraft, it woud have used about 2900 feet of the remaining runway before thrust reverser deployment 12 second later. However the aircraft would have slowed to some degree within 12 seconds (by how much will have to come from the FDR), so it actually would have used somewhat less runway than this before reverser deployment.
I'm sorry if I missed this (if it was posted earlier), but has anyone posted the braking performance of this aircraft, at the landing weight used, in those conditions? Since there doesn't seem to have been any anomilies with the aircraft systems or the landing configuration, was it actually possible to stop the aircraft after it touched down 4000 feet from the threshold?