I started keeping a TBR list some time ago. I'm not exactly sure when it started, but the need to remember what I wanted to read finally outgrew my brain and landed on paper.
From a paper list, I moved to an Excel file, then a Google sheet, and, now, a Pinterest board. (Technically, two boards: one for personal reads and one for professional reads.)
Between these two boards, I easily have over 500 books on my TBR list. One of the reasons I moved from a Google sheet to Pinterest is because I didn't want to actually know how long my TBR list was. (Plus, it's easier to pick which book I want to read next when I can look at the pretty covers.)
On average, I read about 50 books a year. It would take me over 10 years just to get through what is currently on my lists. That means a decade of never adding new titles and only reading what I've found so far.
Not going to happen.
The joy of the TBR list is that it's aspirational. I know that I am never going to read everything on there. I know that every time I add a new book, it makes it far less likely that I will read a book that has been on the list for months or even years.
My TBR list is not something I ever want to "finish." If I finish it, it means that I've stopped coming across books that look interesting. It means that I've stopped exploring new topics, ideas, and stories. It means that I stopped caring about learning and experiencing things.
I don't ever want that to happen.
My TBR list is a living extension of what I find interesting. When I scroll back through it to find my next read, I love seeing the clusters where I binged on one topic, idea, or author. I love that it shows my evolution as both a reader and a person.
My TBR is a reflection of who I am and, while I do prune titles occasionally, I hope my list forever grows.