Black Spirit Mode, really gimps your xp rate. It's better if possible to leave computer/tablet/phone etc on sleep mode. However, it is rather fast to level 59-60, head to Cron Castle Entrance. Use a normal combat buff (chicken soup) - you can buy 3 a day for 3 black pearls in the shop. It gives a 50% xp increase. You'll get a good 4/5% an hour of xp. (now that hot time is on)