Four minutes sounds a bit short for a glide duration from 35000’.
Glide implies there is lift (from the wings) involved. They were not gliding, which is unpowered flight.
They were 100% stalled; falling at essentially terminal velocity for a ‘flat’ aircraft.
~10000 fpm = about ~115 mph down.
Hitting at that speed is why so much of the structure of the aircraft and the bodies was identifiable. This as opposed to the Value Jet plane that augured in to the Everglades at over 500 KIAS, nose first. They found only splintered aluminum , gold jewelry, teeth and so on.