Unless everyone is asleep at their keyboards and controllers, no alliance raid should ever take an hour to complete, let alone Royal City of Rabanastre and the other Ivalice raids. Especially considering they've already been nerfed into the ground via Ilvl creep and the echo buff being active at all times unless you somehow mistakenly click it off.

Also, turning an Alliance Raid into yet another 4 floor normal raid tier when those already exist seems pretty redundant, unless you like all of your arenas being technicolor circles, squares, and maybe even rectangles floating in the sky.