I actually did this last night because was to hit lvl48 before the weekend was over. I was about halfway through 47 and it was really late, but I was standing next to the cloth master and realized, "oh hey! I can get 48 by doing turn ins!" Sure enough I did! Not only that but my warlock (he was already 48) didn't do any turn ins so now my team has caught up with his XP. Stupid warlock pet quests.