i wont tell you how long it will takes...but i will not guarantee powerlvling to more than lvl30..cuz u might not got the enought money to spend on ur new degree gears and weap...and then u will lost the taste of enjoying playing the europe chars..(i did on hellsing and i got bored,one week wasted

)
i only power leveled my Grimjow to 25 so i can be near to my guildis whos in lvl20+ or less and when they need a leader that got his level near to them for the statisfication (imo)