What's it take to get there like 18 months one way?
it's roughly between 10 and 20 months, but those are averaged with unmanned spacecraft.
It's impossible anyways, the solar radiation is too severe, no gravity on your cardiovascular system, blood clots, etc.
the human body has evolved specifically for a gravity environment.
It's impossible as we know it.
The straightest line/shortest distance to mars involve getting umm close to the ole ball of nuclear fire that we have in the center of our planetary system.
The gravity/solar radiation is a problem for organic lifeforms..
If it did happen, it's be a one way trip, and the inevitability of it would be a fatal trip...
"take one for the team" kinda
But a "successful" trip for humans?
Well I guess it depends on your definition of successful...
If by that you mean a human got there just in time to die a really horrible and painful death..
I'm a science nerd, and a scifi writer, I can give you a BUNCH of reasons why humans cant live there
As we know it.