what usage time should my battery get before i complain/replace it? (4s)

i ask because picked iphone because needed smartphone battery life. 6 hours usage bluetooth off, no email hooked up, , no wifi on. last 2 days i've had wifi on see kind of difference in battery , web speeds.

 

so how have last 2 days been?

i've see 7-8 hours on phone (iphone 4s). 6 if make lot of calls. never have wifi enabled, have location services enabled apps, , of apps push notifications , email fetches every 15 min.

 

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