I need some help with a Duna > Kerbin > Duna trajectory

[Fireheart318]

Is it possible to fly by Kerbin from Duna and get back again without using too much extra fuel?

Specifically, I need to go from Duna to Kerbin and back to Duna again (bonus points if you can get me by Eve, Joo, or Dres as well without using too much fuel). The current time is Year 1, day 235, so I can leave at about Y1, D237 to be safe. When do I leave?

[Pand5461]

Useful links:

• Scott Manley's tutorial on how to get to another planets:

• Transfer window planner:

https://alexmoon.github.io/ksp/

• Trajectory optimization tool: