I've found different ways to read books about TMS.
There are book(s) to be read that can provide an introduction to TMS and a way to try to identify with the stories and personality types described there. It's a way for us to connect TMS to the symptoms we are experiencing.
@JanAtheCPA mentions a couple books above (Dr. Sarno & Claire Weekes) that were part of a foundation for her (the Structured Educational Program was included in that foundation).
Once you find passages that you really connect with, those passages/pages/chapter(s) can be touchstones that you return to for reassurance. Re-reading sections of Dr. Sarno's writings can be so helpful and grounding. When you know it's TMS in your heart, but your head still gets in the way with doubts (and maybe symptoms!), this can help.
Short reads matter here. Having the books handy (physically or virtually) during the day is super helpful. I've left copies in my car and at work, and even carried around a book in a backpack during outings or travels.
Then, there's finding brand new books (or other audio materials, like podcasts, interviews, etc.) that provide a different perspective, or just re-state the basics in new way. Keeping things fresh is a great thing. We're fortunate to be dealing with TMS in these times when there are so many resources available. There was a time when Dr. Sarno's books (and a few others) were just about all that was out there.
There's also being open to books that are not exactly related to TMS, but help us along on the journey. There's a ton of different things that can help us here. I've had books recommended by a therapist. I've read books about physical activities I was pursuing, and that was so helpful with my TMS because pursuing those activities was blocked by my symptoms at one point. My brain got such a talking-to (there's absolutely nothing wrong with me--look at what I'm doing now!) when I was really active athletically. There are books on yoga/meditation/anxiety/mindfulness and then there could be books that address some of the issues that cause our perfectionism, people-pleasing, avoidance of emotions, etc.
I think with so many of these reading practices, it's internalizing what you read. As
@JanAtheCPA suggests above, it's not the time spent, but the knowledge received.
I wish you well!