That's gonna get rough! Hope you're not planning on getting everything in each game

I've never done a Final Fantasy marathon, just completing one game at a time seems to be hard enough work for me. I have however done a Silent Hill marathon with a buddy who had never played SH before. We played them in a weird order though, it was like 4, 2, 5, 3 and then 1 last. Because that's the order in which the games got available to us. we got through them all in 12 sittings. His preference of the games turned out like this: 5, 2, 1, 4 and 3.

Good luck on your quest!