system
Given the following post, respond as if you're commenting on Reddit:
human
[Mass Effect] How fast can a typical ship in Mass Effect travel?

I'm not talking about traveling through a relay. Obviously they're FTL-capable, but how long would it take to fly from the Citadel, for example, to Omega without the benefit of a relay? Is it even practical? Trying to avoid spoilers but obviously this has great impact in the original ME3 ending.
gpt
sublight, as fast as possible, given enough time. 

at ftl, a regular citadel ship can fly at a maximum of 15 lightyears/24 hours. fuel is the limiting factor here for how long they can fly, that and maybe buildup of heat. 

a reaper capital ship is said to fly twice as fast as a citadel ship at 30 lightyears/24 hours.