I understand the issues related to the long periods it would take for missions, however, the way the game would be played differs from KSP in the respect that in KSP a few missions take place over a single play session, while on this game, single missions would take place over multiple play sessions. Another thing to note would be that this game will be more fixed around the home planet and it's moon rather than the other planets. The planets would be visit-able, however, these planets would be the goals for the experienced players. I expect that most players of the game would go no further than the planets orbits and most of their goals would be to go to the moon. Unlike with KSP, there would be more of an insensitive to send up satellites and space stations rather than to explore the other planets because science on this game would actually be useful to the player beyond giving them science points; for example telescopes could be erected in space to spot asteroids. Thanks for the feedback though; I think that I'm comfortable with most missions lasting a few days, but I don't like the idea of missions lasting longer than a month.