My company has a mandated QRH review every day and as long as I review that with my FO, a normal line pilot will go through every procedure in the QRH at least once per year. But I find something always comes up that gets me into any of the company or training documents every day.
Just the other day, a parcel arrived at the aircraft without any documentation. That's no bueno, so it didn't come with us. But it did make me review our Ground Operations Manual. Not because I was wrong but because it has been a while since I read it. Twenty minutes of reading later and most of it had come back to me enough that if I had to take the exam, I felt I'd pass just fine. Did I finish the manual? No, only those sections that pertain to flight crew, but that's OK. I don't really need to know about how the parcel is accepted in the cargo room from the delivery truck, but it did refresh my memory about things like NOTOCs and separation of dangerous goods, and what must and may be on an air waybill.
Likewise, a few weeks ago I had an electrical caution light come on during the cruise. We ran the QRH, reset the system, and continued on our merry way. In the hotel that night I pulled the electrical system up on the tablet. I awoke later to find the tablet on my chest and about ten pages in, but it's all good, I finished the section and went back to bed.
Your brain is a muscle, so you have to let it relax. Reading for a couple of hours per flight means you're missing some very important "in the moment" things, which are far more important than "the K22 relay connects the main distribution bus to the main feeder bus" type things.