I dont think I would ever go more than 8 weeks of MaxV training because like the last post you probably are not getting any benefit out of it anymore. Continue to change emphasis so your body continues adaptation. I would look to go to speed endurance to lock in the new speed like you had said. A 4-6 week block of special endurance should be fine. Just start tapering a couple weeks out but keep intensity high and you will be fine.
