Yes, you did catch them in 2 hours.  I just tracked the time awkwardly.<br/><br/>The way the timeline goes is that it took you 4 hours to get from Port Wander to Ares, 2 hours to fight in the system, and 2 hours to catch the enemy convoy.<br/><br/>The Ares system just happens to have a jump point really really close to the planet, which makes the system a bit tricky to defend.