[Space, Spaceships] Mars Semi-Cycler?

[RyanW]

Originally Posted by DaltonS

That's almost 8 weeks difference. Have I missed something?

The longer transfer allows a shorter return. A 130 day transfer would be a 4 year trip for free return abort (or for a cycler). A 180 day transfer would be only a 2 year trip for the return. See this Wikipedia article.