I remember reading in Shadows of the Empire how Vader loved to "occasionally get into the TIE Fighter and flex his force muscles" (Star Wars 4).
With the new Rogue One movie coming up, it seems they may have a point where we get to see this again-remember from Star Wars 4 and 6 the Rebels said many died bringing them information on the Death Star, and there aren't any Jedi Masters to really challenge Vader.
So I figured we might get a nice space-fighter climatic battle (crossing fingers). So how many ships would it take to overwhelm him?