http://kotaku.com/5738668/short-cords-long-friend-lists-and-other-burning-3ds-questions-answered
We get 100 people on our friends lists, and with 3D in full effect turned on, we'll get 3-5 hours, up to 8 hours with no 3D, and more with no WiFi on
So the 3DS can actually last up to 8-10 hours likely
Basically just turn on the 3D when something cool is about to happen.
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