I levelled 15 - 46 in a few nights so far using random dungeons, total play time is 18 hours - but that's not solid levelling.

The bonus EXP upon completing a random dungeon is fairly significant - once I've done a run completing quests, all subsequent runs are the shortest route to the end boss, this completing the instance and gaining the exp reward.

@ lvl 46 i took a moment to go get my mounts - up until now my warriors and shaman have been positioned by the trainers.