Why should astronauts speed as little time travelling to mars?
Astronauts should not be going to Mars in the first place. It is
unlikely that they could survive long since Mars is extremely cold
(the North pole is balmy by comparison), extremely dry (the Sahara
Desert is a rain forest by comparison), and has an extremely thin
atmosphere (well beyond any chance of supporting life). Don't be
fooled by the gullies and canyons of Mars. If you wish to see how I
think they formed, read http://charles_w.tripod.com/mars.html .
Sincerely, Charles weber