2 months : Lifetime =/= Lifetime: 2 months
Was the editor asleep? It's the little things that ruins the story.
Although what they could have done, was that transuniverse trasfer could only happen diagonally, they can't cross into the other universe directly, they have to cross into the other universe's future or past or something. If different universes are formed by different timelines, this make sense...although this universe ain't a divergent timeline eh?