Join Date: Jul 2001
Location: Boston, Jo'burg, HK
Programs: AA EXP, Hyatt Lifetime Diamond, CX Gold, Mrs. Pickles travels for free
Posts: 13,866
That's farkin' nonsense. Take the Chuo Line from Shinjuku to Tokyo Station and take the train from there.
Ten minutes to transfer from the Yamanote to the Shinkansen is sufficient if you know what you are doing and aren't carrying luggage. If not, you will give yourself a heart attack trying to make it.