A common theme I'll see in mentions of planned missions to Mars is that it would last about 2 years due to how the orbits of Mars and Earth align, this often coincides with the idea of a Mars Cycler: https://ancillary-proxy.atarimworker.io?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2F...
The cycler just seems to make lots of sense. I'm surprised it hasn't been attempted as a method to move probes and other unmanned craft to Mars and back. Or on a smaller scale, a lunar cycler. The propulsion needs for interplanetary travel are different than the needs for takeoff and landing. Separating them into two different craft just seems like a good idea to try.
APL is a write-only language. I can write programs in APL, but I can't read any of them. -- Roy Keir