From lvl 1-55 will cost you 89908 Exp.
From lvl 55- 56 is only 83840 Exp.

So it is just like lvling a whole new character from lvl 1-55 except shorter.
Tips: you should use Exp pots to lvl faster.

GL on the long journey


I got the numbers from hidden_lantern's Guide Site
You should definitely check it out!

Click here for his post

Click here for his guide