I had initially thought it'd be Dr Stone would be the quickest to end since it's generally the fastest paced, but if MHA's final arc was really planned to be just one arc and not a full length part 3 that makes it more of a toss-up. It could still last a while of course knowing how battle shounen can play out, but it doesn't sound like it'll be 200+ chapters long at least like part 2. Could we possibly even see a late-2022 ending?
What's everyone else's guess on who'll end first between the series in their final arcs? Jujutsu, MHA, or Dr Stone?