The Certified Information Systems Security Professional which would be popularly known as CISSP for short is considered as the gold standard of professional individual certifications in the field of information security. A quick search of job boards with the keyword "CISSP" would usually reveal to you with the hundreds of jobs posted by employers who are looking to hire people with this certification.
Unlike some professional IT certifications, the CISSP doesn’t just focus on a particular product or technology that would become outdated. The CISSP test bank is considered to remain continuously updated so that it could remain relevant. Some governments, as well as commercial employers, are going to require that prospective hires which already have the certification as a prerequisite for certain jobs.
If you've decided to pursue this certification, you would need to make a substantial time commitment to go through its study process. Everyone learns differently, and what works for a certain individual might not work for someone else. While some there are also some excellent boot camps, like SPOTO, which are available for people who have the time as well as resources to attend such a program, which you can be just as successful following as you might be by following a well-conceived self-study route.
The short answer to your question is that it all depends on how much knowledge you have gained already and how is your schedule. It might be 10 hours a week or 20 hours a week and so much more. But if you go through the following study plan, you would be able to shorten your study time for this exam.
Set a Test Date and Preparation Schedule:
Until you would be able to pay for the test, you might not mentally commit yourself to prepare for it. Once you have paid for the exam and set a test date, you have a vested interest in achieving the goal. Set aside a time for each day which would be devoted to testing preparation, whether it is for reading or whether it may be for taking practice quizzes. You are supposed to focus on studying a different domain each week if it would be possible for you.
Obtain More Than One Preparation Book
You would be able to buy plenty of books on preparing for the CISSP exam. You would require to purchase the "Official Guide to the CISSP CBK" because it is an authoritative source provided by the ISC2's on all test material. Other highly rated resources which are going to include "CISSP All-in-One Exam Guide" by Shon Harris's and the "CISSP Prep Guide" from Vines and Krutz. These guides would be usually going to be updated regularly. Make sure you are purchasing the latest version of the book so that you would be studying the outdated material.
Take Practice Quizzes
One of the best sites to gain the CISSP study-related material is SPOTO. SPOTO Training modules offers practice tests on the CISSP material. You would be able to choose the length of the practice test you want to take as well as which topic domain or domains you wish the questions to come from. Nothing is going to prepare the students for better for standardized tests than doing as many sample practice questions as possible, as long as they come from an authoritative source, like that offered by SPOTO.
Prepare Your Body for the Test
This six-hour exam of CISSP wouldn’t have any scheduled breaks. You could go to the bathroom and go to the back of the test area for having a snack, but that's it. You would need to prepare your body so that you would be able to sit for an extended period. Your goal should be to make yourself and keep yourself as comfortable as possible while appearing for the test.
So, if you go through this study plan and if you acquire the prep courses offered by the SPOTO, you would be able to enhance your knowledge and ease your study path with it.