how long it should have taken for the fire truck(s) to roll?
30 seconds to roll, another 60 to reach the a/c IF it had crashed at the point furthest away from the fire station. Total 90 to water on fire.
That's the ICAO standard I believe, at least the norm in most of Europe.
The question is how long it took for ATC to realize they had crashed, and hit the alarm. (Was the visibility good enough to see the crash site)
I guess most in this forum has seen the time / temperature graphs for aircraft fire. At more than 90 secs you are rapidly getting cooked no matter what.
I watched them remove the wreckage on CNN last night. Hope they don't need it for post crash analysis, they where a tad rough with the heavy equipment.