Originally Posted by BigBirdTexas
My fright will arrive at 16:25 p.m. There is a NEX depart at 17:47 and the next one at 18:46. If we could catch the 17:47, we should be fine. Unless the immigration would take longer than one hour. Still, after the custom, we would have to exchange the voucher for a JREast pass ticket and find a place to drop off some of our larger lugguages. Our next stop after Japan will be Hong Kong - our final shopping trip!

Sorry to piss in everybody's soup here, but there's a 18:13 NEX, which puts the OP in Tokyo Station at 19:13, with 45 minutes to leisurely amble to the Shinkansen tracks.