A fast marching pace of 180 steps per minute, 36 inches in length for the Marine Corps and Navy, 30 inches in length for the Army. It is not really double the speed of quick time as quick time is 112-120 steps per minute
fastest rate of marching (Military); payment of a worker at twice the normal rate per hour
a doubled wage (for working overtime) a fast marching pace (180 steps/min) or slow jog at a faster speed; "now let's play the piece again double-quick
double pay given to someone when they work at a time when people do not normally work