Well you can always change your mind back after 120 or before if you feel confident. Either way good luck =3

and yes the first few lvl never take long it goes by fast. But the higher you get the slower it becomes -.- some days you feel like 2-3 weeks has gone by and you still haven't gotten 1 lvl. With me now its like 1 month per lvl. I get like 400 exp from sharks and that's with 3x pots on the weekends (about 170 on weekdays). I seem to heavily rely on 15round for majority of my exp from capsules. Sad thing is I don't always log in every Fridays to do 15round so missing that one or two weeks is like uuuuuggggee takes longer.
My sister Is 180+ and it takes her about 2-3 months to get just 1 lvl. She would have already been done but she pretty much quit now and moved on to another game.

Aniiiiiways~ much luck tomorrow at CP. Its been a while since I myself have done it I usually always sleep in on Sundays and then later after I wake up I get lazy never in the mood to log my full team so never bother to go. lol

tip; First 6 floor are easy and fast but after you get to the 7th floor (Scorpio) and further on, use your earth to stone wall your characters and use your Lan to stone wall your pets. one another pet (like Shasha maybe other than sealing) use her to keep their sp replenished in case they run out while walling, be wary of magic mobs.

tip; having FB helps a lot on the human floors.