204 No Content
Custom Title 2
I'm resisting the temptation to bust out the old Orbital Mechanics textbook.
In the real world at least, you can do a fast transfer orbit to Mars and get there in only 5 months instead of 9, for about 60% more fuel, but you'd have to leave a bit earlier. Most any trick that could get one of the missions to Mars substantially quicker than the others would have to be played relatively early in the mission and require a lot of fuel.