In Europa Report, is the length of the journey to Europa ever mentioned? How long did it take? Is the route described?
At the time when the crew loses contact with Earth, because of the solar storm. They have been travelling to Europa for about 1 year.
As stated in Wikipedia:
io9.com it states it was a multi-year mission:
WikiAnswers states that it's currently a 5 year travel time to Europa. There is no supporting links to support those claims. The statement could be based upon NASA's previous missions, but those missions could be designed for efficient fuel consumption and not human survivability.
I know that it takes a NASA craft 9 months to fly from Earth to Mars during the shortest launch window. Jupiter is much farther than Mars but travel time is relative to speed. So a travel time of 1 year sounds unrealistic to me. The craft has to enter orbit of Europa and at 1 year travel it would be forced to do a ballistic fly-by.
After reading about NASA's planned mission to Europa in 2021 it doesn't state how long it would take to get there, but it does mention a mission time of 2.5 years once it arrives. I would think such a long mission time implies a long travel time as well.