I leave wifi on all the time just to make my life simpler. I find I get a good 8 hours. Reading has no adverse affect on battery for me. Some of the fancier games do.
This translates into about 2 days before I plug in. A lot of the time I simply have it attached to USB while I'm doing something else and it gives it enough juice to continue without a full plug in for the night.
For example Thursday I fully charged for when I got home from work and it's Saturday a.m. and I'm at 85% but I've not used the wall adapter and i've been surfing, reading, arching TWiT streams all last night and this morning.
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