I think 25-35 sounds about right for an LSAT-heavy week. Right now I'm doing about 20ish, but as soon as I have more time I will kick it up to about 30-35. I know I need to use brute force on games because I've already done the bible and know the concepts, yet am horrifically slow, so I plan to put in a lot of time, but I don't know if doing 8 hrs/day minimum every day is doable (or even desirable for performance) but I guess it just depends on your style. I do think it is important to not absolutely hate the test and I wonder if I would grow to loathe it if I literally made it almost my every waking moment.
edit - I forgot to mention that diagnostics are not the be-all, end-all of indicating who will be the top scorers. For example, I got a 160 diagnostic and there are plenty of people (
hehe) with lower diags who are outscoring me. But hey, I still plan on being a top scorer too (hopehopehopehope)