Well, I couldn't find a date, but the first manned mission to Mars was in 2063. As such, Evo's base is being built fast. They have been militarizing the base since the blurb in Sixth World Almenac circa 2072. So... assuming they were using nuclear fuel to avoid Hohmann transfer orbits, about 4 months to get there and four months to get back. Figure they probably did at least 10 "investigative" missions to study the planet before being ready to set up a base; with overlap, it probably would take 4-5 years to gather all the intel. Launch the base building shuttles around 2068, with ground braking in 2069? That's a VERY rigorous schedule, but from the blurbs, it sounds like Evo is very enthusiastic about the project.