Danielm7 said: Agree with the others, you don't want to go into that cold or little chance you'll retain everything you need. The time to study thing is based on a ton of variables, none of which I know about you. For example, what is your prior experience level with the domains? Judging from your signature, the OSCP is impressive but probably of no use for this one, the Sec+ would have more cross over, and with the current version of the CISSP exam I don't know how much the cloud material is covered. I took it with less than a month of concentrated self study, but I had a wide background covering a lot of the material beforehand. If you really want to pass it I'd start reviewing material now. I'd probably go through the full cybrary CISSP course beforehand, it's free and she gives tons of tips that help narrow down what material you should focus on as the whole CBK is huge if you don't have any direction.