"You need to be in the position where it is the cost of the fuel that actually matters and not the cost of building the rocket in the first place."

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It would take six months to get to Mars if you go there slowly, with optimal energy cost. Then it would take eighteen months for the planets to realign. Then it would take six months to get back, though I can see getting the travel time down to three months pretty quickly if America has the will.

— Elon Musk