According to Richard Graham in "SR-71 Revealed: The Inside Story", the Lockheed SR-71 Reconnaissance plane accelerates from a standing start to a speed of Mach 3 (3 times the speed of sound) "in about 14 minutes".

Assuming that the time is exactly 14 minutes, and the speed of sound is 1100 feet per second, this is an average acceleration of feet per second squared. Assuming that the acceleration is constant, during that time your SR-71 covers a distance of miles.