I like 3 months: 1 month for content review, and 2 months for practice tests and targeted review.
I did not follow any specific schedule. I just had looked at the videos in DAT Bootcamp and spaced it out evenly for content review. I would also use supplementary resources as needed. I would slow down on areas I felt I didn’t fully understand and go faster on areas I was very familiar with. I spent the last two months on full lengths (with time to review select questions at the end) and three passes through DAT Destroyer. Beyond this, I was very flexible with my schedule. Don’t waste time on stuff you are good at.
Oh and we’ll before I started studying for anything else, I was already working on PAT Generators. Start early, find the best strategies for yourself, then get good and get fast at them. That takes time.