When I was studying, I logged it all. I would read through the Wiley book (15-30 hours depending on the exam), then do MCQs (averaged 1-3 a minute depending on the exam). So, IIRC, I studied around 30 or 40 hours for BEC; that was about 15 hours of reading the book, and about 15-25 hours of doing MCQs. BEC's MCQs were wordier and required more computations (except some of the IT questions), so they were probably at the 1 per minute end of the scale; 15 hours would have been 900 MCQs, and I think I did a little more than that, so probably was a little over 15 hours of MCQs. I did do a couple WCs, but that was just about an hour total. FAR was 60-70 hours IIRC; that book was the longest, so probably 30 hours to read the book, then about 30-40 hours of MCQs. Those MCQs were also rough, but at 1 per minute, that would have been around 1800 MCQs, and I don't think I got that many done (planned to, but didn't make it that far), so either I had inefficient study sessions, or maybe I didn't get 30 hours into MCQs. AUD, though, had quicker MCQs; they were pretty much read a couple sentences and either you know it or your don't, so I think those were around 3 per minute when I was doing well, 2 per minute if I wasn't focused. So, AUD was about 30 or 35 hours, and the reading was about 20 or 25 of those hours, then around 10-15 hours of MCQs. At 2 per minute, 10 hours would be 1200 MCQs; I think I did a little more than that, so I had some study sessions that were 3 per minute, or I did more towards the 15 hours end of the study time. REG I don't remember my numbers at all; it was my last exam, I was finishing one job and starting another, and also looking for a new place to live, so I wasn't worried with tracking so much as doing!
So…for me, studying was reading the book and doing MCQs. I used audio a teensy bit, and also sometimes pulled up videos online to watch (used a Free Blitz weekend back when Blitz was just a small supplemental tool; used free samples of Roger and such to try to understand concepts I struggled with; and of course good ol' YouTube), but most studying was reading or doing MCQs. Because I studied over a short period of weeks (like AUD was 3 weeks IIRC), my shorter total study time still allowed the studying to be close to the test time, so short-term memory was able to carry me through where long-term memory might or might not have known enough to get me through the test.
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