User blog comment:Jackalex13/What tropical planet did the Normandy crew land on?/@comment-5029054-20120417222301

Let's assume Joker manages to leave after dropping the guys off for the fight.

It took them something like 2 hours to get from (assuming Shepard did a complete play-through and went to Heretic Station after getting the IFF) to the Omega-4 Relay. That's 2.15 systems (I count Sahrabarik as 1.5 since it's from Mass Relay to Omega-4 Relay), and a Mass Relay jump, which is essentially (and for calculations here) instantaneous.

Assuming all systems are the same size, that means there's a 2.15 system to 2 hours, or 1 hour per 1.075 systems, or about 55 minutes per system. If you make it through the Earth levels with killing everything in one shot, and finally hit the Crucible, it'd be about 1 hour or so. Joker barely made it to another system, so, the only planet he could've made it to would be one in the next system, Arcturus.

There are no habitable (at least by the sights you see when the leave the Normandy) planets in the Arcturus system, however, it would be reasonable to assume the gas giants have moons, which could possibly support life and an ecosystem. Bam. A moon of one of the three planets of Arcturus.

That, or Indoctrination Theory/EA or Hudson being bad at game making.