Hi Aspirant

Yes you can crack the exam and you don't to give 16-17 hours because nobody can do it seriously .So in the beginning think about 10-12 hours.This is possible also.What you can do  is make a routine that suits you and try to follow.Don't make it hectic so that after 2-3 day you leave it following.

you can make time slot like this:

9am to 1pm(4 hrs):

take lunch break of 1 hr ,eat and take rest also

3pm to 6pm (3 hrs):

take a break ,watch tv/shows .you may go for walk and take rest also for 1hr atleast.

8pm-9pm:Revise what you have read yet

9pm -9:30 pm :take your dinner 

9:30-12:00 (2.5 hr ):

this time 9.5 hr is in your hand without being hectic .You should  start from this .Schedule your subject according to you.

Do revision everyday.

After 2 month start giving mock test and solve sample paper in these time slots only.

Be regular ,this is more important that many more hours for a single day

All the best