Need Help - Series 7 & 63

Hi all...
I would be thankful if someone could tell me ,

How much time could it take for a person to prepare for 
Series 7 & 63?

For how long should a person prepare for these 2 exams..?

Any advice...!!

And any online material that I can look up to... should be free..
any other books you might suggest...!!

thanks 
Girish