Citadel Ships can go an average of 15LY/day = 0.625LY/Hr for an average of 50 hours for a total distance of 31.25LY before discharge is needed.
Based upon a variety of prior calculations I estimate a normal Frigate of comparable size to the Cabira has an engine power of 1,506MW which with an exhaust thrust of24,500m/s (Anti-Matter) gives a thrust of:
T = 2*1,506,015,000/24,500 = 122,940 newtons
If we assume it has the same mass as the Cabira, roughly 2,500,000kg, then we know it has a pre-me acceleration of 0.049176m/s.
By applying the Brachistochrone equation we can work out how much the application of Mass Effect increases it's acceleration:
T = 2 * sqrt[ D/A]
180,000 = 2 * sqrt[ 295,647,827,268,150,000/A]
90,000 = sqrt[ 295,647,827,268,150,000/A]
8,100,000,000 = 295,647,827,268,150,000/A
A = 295,647,827,268,150,000/8,100,000,000
A = 36,499,731.7615m/s/s
That is an astounding 742,226,528 times faster then it goes before mass effect. To achieve that level of acceleration requires a mass of 3.37 grams which is unsurprisingly a 742,226,528 times decrease in mass.
The Cabira has three rear facing Repuslors each with a thrust of 2.5MN for a total thrust of 7.5MN. This gives her an acceleration of 3m/s/s or about about 1/3 of a gee.
Assuming it has the same mass reduction the Cabira has an FTL acceleration of 2,226,679,585m/s/s. That makes her 61 times faster.
Now repulsor blasts have a speed but who knows how that relates to the maximum speed they can accelerate. Frankly I think we can just ignore the problem since even a hundred hours of accelerating, it would only get half that due to the need to decelerate, at 3m/s/s doesn't even get the Cabira up to 1PSL.
Applying the FTL acceleration to the Brachistochrone equation and assuming her multi-drive core allows twice the FTL endurance:
360,000 = 2 * sqrt[ D/2,226,679,585 ]
180,000 = sqrt[ D/2,226,679,585 ]
32,400,000,000 = D/2,226,679,585
D = 32,400,000,000 * 2,226,679,585
D = 72,144,418,554,000,000,000
D = 7,626LY
So. 244x increase in traveling distance. I think I broke the game.
For reference Earth is about 26,000LY from the center of the Milky way and the whole galaxy is only 100,000LY. It would take the Cabira about 14 hops, two months plus discharge time, to travel from one end to the other.
Did I mention I broke the game?