How long should I charge my HTC Desire Z for?

Just got it tonight, put it on charge, its the first charge brand new phone, how long should I leave it on charge for, also will using it whilst its charging affect the charge and is it better for it to be turned on or off?
I think i went wrong with my last phone the google G1 as i didnt charge it the first time for very long and it had a bad abttery life, so although i cant wait to use it, i really dont wanna destroy the battery life on this phone due to not charging it for long enough
thanks!
 
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