The corporate lawyers representing the DNC will drag it out and appeal any ruling not in their favor. That is assuming the court does not dismiss the case as a hacker is the "real villain".

and I'm thrilled it's been filed. I think it will depend on the judge they draw as to the speed of action. Oddly enough a RW judge might be best for this suit. However, I'm no lawyer.

We did have a party suit to change candidates here in Alabama. From wiki:

In 1986, the Democratic primary for the gubernatorial race saw then Attorney General Charles Graddick of Mobile in a runoff with Baxley, then the lieutenant governor. Graddick won by a few thousand votes, but Baxley appealed to the Alabama Supreme Court, which ruled Graddick had violated primary regulations by encouraging Republicans to “cross over” and vote as Democrats. The court told the Democratic Party to hold another election or to select Baxley as the nominee. The party hence confirmed Baxley as its candidate.

Accustomed to a one-party state in which the open primary for the Democratic nomination was considered tantamount to election, many Alabama voters took out their frustrations by voting against Baxley and for Guy Hunt, the GOP nominee. Hunt won the election by a large margin, giving Alabama its first Republican governor since Reconstruction.

The suit only took a couple of weeks. Of course the machine fix was in with the court.