I did 60 - 70 by queuing up for the Daily Roulettes while doing FATEs and Hunts. Even the little One Star hunts give over 100k XP after you finish them. PvP used to give the best XP before they nerfed it but after PoTD actually gives more XP unless you get 1st place every time. But who wants to mindlessly do PoTD over and over again? I sure didn't. Also, you get the best XP doing dungeons/daily roulettes while FATE/Hunt grinding anyways. Also, challenge log.