I agree, it is boring, as I've tried it. Generally I try to do about a page a day from a couple selections, but it depends, as sometimes I get completely taken by one particular piece, and spend hours on it. By the way, how does one force oneself to learn a piece one doesn't really like? I have to learn another Bach Prelude and Fugue, but honestly, I find most of them boring. As soon as I declare confidently "I'm going to practice this for the next hour," in five minutes I'm practicing Rachmaninoff or Chopin or Sorabji or something I like. I've just never been one for Bach, Haydn, or Mozart. Unfortunately, I don't think I ever will be.
By the way, how does one force oneself to learn a piece one doesn't really like?