How long is the actual battery life of Macbook Pro?

what i don't get is how fast my battery drains out...
my primary usage is document study, photograph editing
web browsing. and occasional accompaniment of music in the back.
my battery life at the moment lasts for 6 hours max..
what should i do to get optimum battery life!??

My empirical experience shows that I get 60% to 70% of Apples advertised hours.  That is reflecting my 'normal' operating conditions.  Web, email, with iTunes in the background as well as Activity Monitor.  CPU intensive applications such as Aperture, Toast, Video viewing etc. drive battery life way down.
Six hours is most acceptable.  That is 'good' in real world conditions.
Look at this:
http://www.apple.com/batteries/notebooks.html
Ciao.

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