The goal of this challenge is to reach Duna, land, plant a flag, and return to Kerbin by the earliest possible ingame date.
1. No cheats outside the editor.
2. No mods that give an unfair advantage using parts or physics changes.
3. All Kerbals must return to Kerbin alive. Stranding them in space or killing them results in mission failure.
4. ISRU is fine, but obviously it takes time and mass. And can't produce Xenon.
5. Multiple launches is fine, but obviousl