I had never heard of that probe until now. Gonna have to look it up. but yeah, I knew a mission using this type of maneuver would require an extra burn to make up the Delta-V to reach Mars. I'm mainly looking at it as a means of conserving fuel, and by extension, weight. I was actually thinking more along the lines of a grav assist around the moon then, during the 'free-fall' back to Earth, use Earths gravity to sling the vehicle out towards Mars, after that it would be a final burn to get to Mars. But then i don't know if that would yield any significant delta-V with that maneuver. In either case, mentioned above, I'm thinking more towards fuel/weight conservation, rather than time scale. although that is obviously a factor too.