I’ve stumbled upon an article written by Petr Lapukhov, who is a 4xCCIE and a CCDE, while searching for CCIE study plans. It is a 3 days a week with 4 hours study time allotted each day and the duration is 48 weeks. Although this is for the old curriculum (version 4), the scheme I think is still applicable to the new curriculum since it will build upon and solidify your fundamental knowledge (very important!) before diving into the advance topics. For more details, below is the link to the blog.
Included in the blog also is a link to Brian McGahan’s video about the overview and preparation for the CCIE exam. He recommended excellent tips and books for review. Below is the link.
“We are what we repeatedly do. Excellence, then, is not an act, but a habit.” – Will Durant