Here are the specs for a B777....
Takeoff distance at MTOW
(sea level, ISA) 8,000 ft
http://en.wikipedia.org/wiki/Boeing_777#Specifications
Sullivan had a 777 pilot call in to his program today.
He claimed to have gotten to rotation in 3500 feet.
That is not takeoff distance. That is required runway length which includes margin of safety and braking after aborted takeoff..
They can takeoff in much shorter distances.