New Macbook Air 13" battery questions?

I just got my new Macbook Air 13" i7,8gb Ram/512GB SSD last December 25. I just came to notice after fully charging and using it (straight usage, no powering off doing installing, learning, etc... beacause I'm new to Mac ), It doesn't reach 12 hours, maybe it took 6 hours Max to recharge again on 10%.
Is it normal for a newbie? or it should be really 12 hours usage in reality?
Please advice.
Thanks in Advance..

12 hours quoted is the result of testing the battery under lab conditions.
Battery runtime will be lower when battery is under real life conditions.
About batteries: http://support.apple.com/kb/HT1446
Best.

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