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I would say that you definitely need to put in some extra time, but more than 6 months? There are so many factors that go into your personal study schedule (work, family, kids, other commitments, etc.) that only you can really answer that.
For me, I have teenagers and a full time job, plus some other commitments so I started a little bit earlier, but it’s up to you. Just get a schedule and try to stick to it.
Best of luck