If you queue for random dungeons you get a 50 min queue.
But for some reason if you queue for Specific Dungeons and mark only the ones marked as between levels 110-120, you get instant queues.
Sometimes i only wait 3-5min.
Also queue alone, because for some reason when i tried to queue with someone else the queue got a little bit bigger. (could be coincidence)
Sorry if this is obvious and everyone already knew about this.