That depends on whom you ask and what they do.
If you turn off AirPort and Bluetooth, dim your screen, aren't using the CD/DVD drive, throttle your processor, and aren't constantly hammering the CPU, you'll probably get the 4 hours of battery life that Apple advertises. However, if you leave everything running full-tilt, you'll be lucky to crack the 2-hour mark. It's all about smart usage habits.
Of course, you should always bring your power adapter so you can plug in whenever possible.
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