45 Seconds
On the very good graph posted by threemiles, it looks like something catastrophic happened about 45 seconds after they started the GA
I'm using the starting point of 2470 seconds to 2515 where the break starts.
After the 2515 mark, it only takes them about 10 seconds to go from 3,500 feet to the ground.
Is there an airspeed plot for the 2515 mark?
Regards,
OBD