Favorite because it lasts the longest is lying in bed/couch/floor with enough pillows behind out to feel supported and likely one more smaller pillow on your lap so the book kind of has somewhere to rest. I usually end up scooting down down down and have to restart and refluff pillows.

I would love if casually sitting in a chair at the table, leaning over a book, flat on the table, lasted longer, but what can you do.