I still think completing all character's skill branches should be possible in a decent time, so we could put that on maybe IMO.
Anyway I have no idea how long such a run would be but it's gonna be really long. It should be done in less than 100 hours, but I think more than 50, even wit a proper routing. I pretty much expect this to be as long as Animal Crossing 10%, which has been attempted RTA and succeded in 60-70 hours. However it's really different from Xenoblade 100% since you can actually route it with a lot of detail, to have a really optimized route... I say a route because obviously you could have a lot of different route considering the amount of objectives to complete.
Anyway I have no idea how long such a run would be but it's gonna be really long. It should be done in less than 100 hours, but I think more than 50, even wit a proper routing. I pretty much expect this to be as long as Animal Crossing 10%, which has been attempted RTA and succeded in 60-70 hours. However it's really different from Xenoblade 100% since you can actually route it with a lot of detail, to have a really optimized route... I say a route because obviously you could have a lot of different route considering the amount of objectives to complete.