How long-lasting is the correct one for a battery in a Mac Book?

To whom it may concern,
I just bought a brand new Mac Book last month, and some of the things I got in mind when I bought it, was the battery long-lasting life, 10 hours, wow! Today I am checking the features of the MacBook and it says 7 hours long-lasting... and you know something, to say that it works seven hours is more real than it works up to ten hours because I have been using my brand new MacBook up to eight hours from 100% to 1% with the display off.
I would like to know why did you decide to fix the information about the features of the battery? Thank you.
Today's features
http://www.apple.com/macbook/features.html
2009's features
http://replay.waybackmachine.org/20100522032553/http://www.apple.com/macbook/fea tures.html

Hi jarhqro and welcome to Apple Discussions.
There are no Apple staff here, it is just member to member forum so you will not get an official answer.
Battery life depends on what you use your computer for. Using it for light browsing with all power saving options set will give you the max but intensive use and no power saving options set will give you the minimum.
Just use and enjoy you new Mac book.
Regards from England,
Alan

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How long-lasting is the correct one for a battery in a Mac Book?

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