How to optimize your headspace for it.
This is why I think that the notion of missions to Mars under the Apollo paradigm are fanciful. There’s a reason (well, OK, more than one) that Elon is building Starship so large. He wants to make it like a cruise, not solitary confinement.
[Update a while later]
Speaking of which, SN1 is entering final assembly for its 20-kilometer flight.