The amount of effort needed to learn a technique is equal to it's rank
E rank - 150 words
D rank - 300 words
C rank - 450 words
B rank - 500 words
A rank - 700 words
S rank - 1000 words
Some techniques will require more then that based on their level of difficulty.
Canon unranked techniques will be given ranks by the admin of the site.
Eye kekkei genkai require training and accomplishing certain task to obtain.