I just finished the Extraterrestrial scenario. My first try took 20 days. I wound up getting the aliens at the Geek festival. I got 3 the first time I went and 2 the second time I went. I just kept exploring until the festival was over. My sim was an Astronaut. But I just had a thought. At some point I'm going to try again to beat my time. My thought is instead of moving him into a house, I'm going to move him on an empty lot and buy the rocket. And a tent, shower, toilet, and frig. put under a roof to protect them from the weather.