With the free 4x EXP Tome grinding the last 3 job levels takes at most 12h in storage or abbey and this is with bad parties.
And you will unlock new quests with every base level which will speed this up a lot.
I guess if you grind 1h the tome each day and then quest 1-2 maps you should be done in a week at most.
addition info you will hit R8clvl15 at lvl around 308-310. =w=.
so⌠pls donât hesitate to use exp card. class lvl is not our problem right now. lol
Cards lv14 for the win.
I hope we can use those early 
i got from r7 class 11 to r8 in just a few hours questing
wow⌠dafuq :I I can barely kill anything 
itâs an SR with high leveled attributes and enhanced gear 
You will be fine especially since you are a cleric. Just join a maven grinding group and all you need to do is heal. It took me about 1 hr with the event exp tome to get from 270~274 so I canât imagine itll take more than 4 hrs max to get from rank 8 from where your class lv. I was also leveling a pally and pallys dont really do anything at maven (mobs there arent demon/mutant)
She can explore maps to get the exp cards
I was about to make a similar thread, i have a Dragoon class lvl 5, is rank 8 doable before the rank reset happens? considering that after you reclaim it you have 14 days to use it, i feel like i either go full ham to reach rank 8 or just stop playing that char until the rank reset so it doesnt go to waste /:
The last thing i would want is to WAIT for any IMC update before i do this or that. as that could take months⌠Just play whichever char u enjoy.