Seems reasonable to me: If you want to know whether astronauts could handle an extended-duration mission to Mars, “ask an astronaut”:http://www.decaturdaily.com/decaturdaily/news/040923/foale.shtml. Specifically, ask one who has logged over a year on orbit, including a 6-month stint living with just one other cosmonaut. His advice? Don’t sweat the niceties, and don’t skimp on oxygen.