Though this is not exactly a normal DPS queue, I was queued up for frontlines one night as Dragoon. I waited around for maybe an hour and fell asleep. 9 hours later after I had woken up I decided to go harvesting in this game. About an hour later in the middle of harvesting I suddenly had a queue pop up, it was the frontlines queue from the night before. That was probably the longest queue I ever had actually finish XD, so I'm guessing 11-12 hours.