While we're crunching numbers, I feel it's worth mentioning that JIIwF will become the longest running attraction in Future World's history in three short months. It will have had a lifespan longer than any other incarnation of anything else there ever has. I remember when people were complaining about how Ellen's Energy Adventure was the oldest thing there and how it was 21 years old at the time of its closure. JII 3 is gonna be 23 this year.
(The current record holder is the Lion King movie that used to play in The Land. It ran for just over 23 years, which is an almost sadder attraction to hold the record considering this is the park that used to have Horizons, JII, SSE '94, etc.)