Well, repulsor drive Would increase the distance ships could go from relays, unless I'm misremembering?
That Should open up more worlds, too.
Or at least, it would if the SA weren't being butts about it
With Repulsors and full load Eezo cores a PI Frigate can manage 60LY/day with an endurance of around 50 hours so that gives a maximum range between discharging at 125LY. Let's be conservative however and say that factoring in discharge time* it can manage 100LY per 50 hours or simply put 2LY/hr.
*Time to find a gas giant, travel to it, spend an hour discharging, and resume course.
The diameter of the galaxy, or at least the important parts where there would be relays, is roughly 100,000LY. Therefore with a 2LY/hr average speed any relay finding trip will take at most 50,000 hours or more approximately; 5 years and and 4 months.
That is a long time but it's also the
maximum time. The average journey is going to be
far shorter. The Codex describes Primary Relays as propelling starships "thousands of light years". Now this could be taken to mean anything between 1,000LY and 999,999LY but going by the galaxy map, I
know it's not the most reliable thing but it's the only thing we have, I'd say they tend to average around 10,000LY.
A 10,000LY trip would only take 5,000 hours or about three and a half months. That is
far more reasonable.
Of course that is only the time taken to travel is only part of it. The ship still has to explore the area to make sure there are no Rachni or other hostile races out there. So I figure six months per trip sounds about right. Which is quite fast considering that you can send out exploration ships for
multiple Relays at once.
Incidentally the only 15LY/day ships, they were probably using even slower ones actually due to fuel concerns, would have taken approximately 2 years and three months just to cover 10,000LY.