Does all reading need to be challenging and mind expanding? A lot of the books were "just for fun" sci-fi/fantasy reads. A few of them were "mind-expanding". It's good to have a mix of the two.
I listen to audiobooks while I walk the dog, which at 4x 30min walks ends up being 120min/day. At 2x speed that alone is ~4 hours of progress per day. I also listen while cooking and cleaning which adds up to a _lot_ of time.
That's one book ever third day. Are you really challenging yourself and expanding your mind, or are these just time wasters?