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Personally I would let it get down to about 20% before charging at least the first time. I'd do it just to make sure that suddenly the battery didn't die a day after it hit 68% or something like that. Right now I tend to charge mine about every 2-3 weeks, which means it gets down around roughly 50% charge before I charge mine. Not for any real strong reason other than I guess in part because then it only take a bit over an hour to charge with the wall adapter instead of closer to 3 hours.
Personal experience, with the 75-90 minutes a day I normally read, I tend to go through about 20% battery charger per week give or take a couple of percent. Of course if you read more than that, or read with a larger font, and thus have to turn pages faster or have wifi on some of the time, etc you'd deffinitely go through the batter faster.
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