(LSJ) Sunset Strip Q

Player A controls the Sunset Strip and taps it on his turn to give all vampires +1 stealth on hunt actions "until your next untap phase". Then, on Player B's turn, Player B calls Disputed Territory and takes control of Sunset Strip. Does the +1 stealth effect still last until player A's untap phase, or does it now linger until Player B's untap phase? Thanks, Matt H.

[ quoted text not captured ] A's untap. It isn't a "while Sunset Strip is tapped ..." effect. You tap it to produce an effect.