Is Open tuition note enough for f8?

OpenTuition is enough to prepare you for attempting BPP revision kit. They also contain most of the real ACCA past papers.

Majority of your time you should spend doing Revision Kit – some people do it even twice – each and every question. The more you practice the more you are prepared for the exam.

If you struggle with topic/question the answers in BPP revision kit are really extensive so you learn from them instead of plowing through study text.

I also recommend reading examiners answers and his reports about exams to get know about do’s and dont’s.

It’s hard to say how much time you will because it is very individual thing. Obviously the earlier you start the better – especially if you plan to attempt other papers as well.