If you're still in need of a Shinkansen timetable, look here.

For a Narita Express timetable, see http://www.jreast.co.jp/e/nex/index.html]here.

Trains in Japan run on a very precise schedule - a couple of years ago, the average Shinkansen, even factoring in delays such as local earthquakes, ran within six seconds of its scheduled time - so the only variables to consider are how long you'll be in line at various places and how long it takes to walk from one platform to another. And since this is FT, you need only ask.