How long does the battery last for a Unibody?

[SDAVE]

I have a 15" MBP (2.66Ghz, late 2008), I usually don't have WiFi turned off, so I just wanted to know how long does it usually last with WiFi off and semi-high brightness setting for the display. The only activity is typing in Word and maybe a few non intensive Photoshop stuff.

I'd like to get an estimate because I have no power adapters where I'll be using it. I know I could get an extra battery, but what for eh?

 

[Bill Gates]

4-5 hours.

 

[Shaduu]

After a full charge, I frequently get five to six hours out of my 13" with that kind of activity.

 

[Bill Gates]

After a full charge, I frequently get five to six hours out of my 13" with that kind of activity.

He's using an older machine.

 

[Ploki]

3 to 4 max..