time to level is heavily dependent on your gear up to the point you one shot the mobs you're attacking.
For example: with all exp modifiers included, ability to one shot, and kishin you would be able to earn over 60b exp per hour. I didn't check the exp totals but that's probably close to lvl 200-210 in only an hour.
Is the maple team working on something to deal with the rampant botting and hacking? I am kind of exhausted reporting players constantly and having no action taken against obvious cheaters.