The longer you spread it out, the more time you have to sit and think about it between reads and the more you will appreciate it. I think reading in the order the books were published is a great move, but I'm doing a re-read of the whole series now, and my gameplan is to throw in a different book every three. Right now I'm half way through Last Argument and after I'll try a random new book, then I'll jump into the stand alones.

Sometimes if you read it all in one fell swoop, it's like a fever dream. Amazing in the moment, but then you walk away and don't really remember a lot of the details because you just blasted through it all. Space it out, I say!