Originally Posted by
Chemystery
The round trip N-EX return must be used within 14 days though, doesn't it? We will be using it for a return, but we are traveling for more than two weeks so I think we will need to purchase each trip separately.
Correct,
Runner123 was doing five nights in Kyoto + one in Tokyo which is less than 14.
For trips longer than 14 days definitely consider alternatives (i.e., limousine buses or Keisei services) which can be cheaper and/or more convenient than NEx. And if Tokyo is only an interchange and not your first stop, then sometimes a domestic flight from NRT to your first destination in Japan can also be a good option.