How long should macbook air battery should last

how long hours does macbook air 2011 13 inch baterry

No, that's not good at all. Its battery probably needs to be replaced. Have Apple evaluate it for replacement. The 60W power adapter is fine.
so the condtion of my notebook is pre used
I am not certain what you mean by that, but if you did not buy your MBA new from Apple, replacing its battery is even more justified. No one knows what its previous owner did with it.
If its battery was permitted to remain completely discharged for a long time (more than a few days) or if it was hardly used at all, for instance if it was always connected to power and has very few charge cycles, or if it was subjected to elevated temperatures for even a brief period of time, it almost certainly requires replacement.
A well-maintained battery in a MBA of that age will have had very approximately 300 to 800 charge cycles. I usually charge that MBA two or three times a week. Check its condition by clicking the  (Apple menu) > About This Mac > System Report > Power.
$129 US includes replacement and a warranty.

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