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In the early 1960s, deployment of rocket-powered ejection seats designed for use at supersonic speeds began in such planes as the Convair F-106 Delta Dart. Six pilots have ejected at speeds exceeding 700 knots (1,300 km/h; 810 mph).
To get there in half the time we should start out moving about twice as fast. The HTO requires us to start with about 33 km/s speed from near Earth. To get there twice as fast weâd need to start out around 60 km/s. That would mean delta-vee around 30 km/s instead of 3. This is ten times larger D v, or ten times more fuel! Weâd also have a big increase in the amount of fuel needed at Mars to slow down from such a high speed.