General ACCAHow long between lessons and exam?

I don't know how many responses I'll get to this question, as I know that most people who use this website don't get lessons, but I thought I'd ask anyway. I'm extremely fortunate that my work pay for lessons, in my old job I tried to self teach myself a lot, but I found it hard to stick to a timetable for the CBE exams, as you can just sit the exams "whenever" and I ended up doing live online lessons. So I have one more CBE exam to take, F4. I'm trying to plan my holiday around my exams. I plan on studying F4 through the summer then starting F7 in September. (I'm currently studying F5/F6 taking them in June) There is a course in manchester which runs 11th June -23rd July on Saturdays. I was just wondering how long a gap you would leave between lessons and exam? I was thinking 2 weeks? I'm always tempted to give a bit longer but obviously to long and then I might find it hard to keep up motivation / unnescarily prolong stress and just wanted to see what was "typical". I'm posting this in general and not F4 as I figure people who have sat F4 so have an idea of how much revision is needed wont be looking in there anymore!