I'm not sure if I should make it a realistic setlist, or use all the songs on both albums, so I'll just do both. Seeing as my two favorites are AMoLaD and TFF, on my "realistic" list, a few songs will be omitted since 20 reunion-length songs is not going to happen.
Realistic:
1. Intro: Satellite 15
2. The Final Frontier
3. El Dorado
4. The Pilgrim
5. The Longest Day
6. The Talisman
7. The Man Who Would Be King
8. Coming Home
9. Brighter Than a Thousand Suns
10. When the Wild Wind Blows
11. Lord of Light
12. The Reincarnation of Benjamin Breeg
13. These Colours Don't Run
(14. Iron Maiden)
-------------------------------------
15. Isle of Avalon
16. Starblind
17. For the Greater Good of God
18. The Legacy
I didn't know whether to include Iron Maiden, so I put it in parentheses.
Now, this is 134 minutes (with Iron Maiden included), which is already (I think) a pretty lengthy setlist, and it omits Different World, Out of the Shadows, Mother of Mercy, and The Alchemist. But if I were to include them it would look like this:
Not at all realistic:
1. Intro: Satellite 15
2. The Final Frontier
3. El Dorado
4. The Pilgrim
5. The Longest Day
6. Mother of Mercy
7. The Talisman
8. The Man Who Would Be King
9. The Alchemist
10. Coming Home
11. Brighter Than a Thousand Suns
12. When the Wild Wind Blows
13. Out of the Shadows
14. Lord of Light
15. The Reincarnation of Benjamin Breeg
16. Different World
17. These Colours Don't Run
(18. Iron Maiden)
-------------------------------------
19. Isle of Avalon
20. Starblind
21. For the Greater Good of God
22. The Legacy
Obviously at 153 minutes this setlist is ridiculously unrealistic. But it was fun to make!