You said that it was last me one year. Since I'm not blind, only someone vaguely interested that would be two days - not for me, but for someone who is blind and thus needs to use this all day.
As for how long it will last? That is an open question. It has small moving plastic parts Making those last is a difficult engineering challenge, so while 2 days (for the blind) wouldn't surprise me, I'm not actually stating anything. Fortunately it is easy for them to test: build one, figure out how fast blind people read, and then throw project Gutenberg at it repeatedly for a while to see how long it lasts. Since it is so easy I'll just stick with how long it lasts is a real worry, but I expect someone to do some tests and tell everyone. Ideally it would be the creators as they can do a failure analysis and maybe fix problems.
If it lasts a blind person a year this is a good win.