I have very short que times on roulette, but waited 60min for Good King Moogle Mog/ Ultima.

As far as I could tell from watching the DF, the reason was an insane lack of tanks (at least on my server group).
DPS and Healer spots were usually full in 15min or so, but no tanks. Can't help it if they really are so scarce at the moment.

What I've been doing for now is either form my own party through the party finder, or grab a book and read until the DF pops.