I would agree with everyone else, the Twins don't like to rapidly promote players so assuming he stays hot or at least above average I would guess somewhere in the June to July window. I would imagine the thinking is let AA pitchers adjust to him on the hot streak and see if they find a hole he can work on there, and if not move him along. I agree though the MLB roster could certainly use anyone on any sort of hot streak stepping into the box, especially from the outfielders.