For how long should my MBP 13" battery last, in normal usage?

I just bought a brand new Macbook Pro 13" on 11.Oct.2011, and there is a concern about the battery life of my MBP, I can only use it for approximately 4-hours. My question is "Is it common or there is a problem with this?" Because, Apple.com advertise at least 7-hours of surfing wireless.

Here is my response to another forum trooper
Ok here are my recommendations for your consideration:
Goto the “apple “on your top menu bar. Click 1stoption (About this Mac) a small screen will appear
andclick on “More Info...which will take to a large another smallscreen with Mac Book Pro in huge
letterslike this: MacBookPro.
Nextgo the “Systems Report” button: press.
NextUnder “Hardware” on the left you'll see “Power” click that.Volia the battery info
Nowlets do an analysis of the info: here's mine a 2 mo. Old 17” MBP:
ModelInformation:
SerialNumber:     ****************** (not shown by me)
Manufacturer:     DP
DeviceName:     ******************(not shown by me)
PackLot Code:     0
PCBLot Code:     0
FirmwareVersion:     406
HardwareRevision:     1
CellRevision:     1102
ChargeInformation:
ChargeRemaining (mAh):     7806
FullyCharged:     No
Charging:     Yes
FullCharge Capacity (mAh):     8488
HealthInformation:
CycleCount:     17
Condition:     Normal
BatteryInstalled:     Yes
Amperage(mA):     2131
Voltage(mV):     12534
OK under“Charge Information” you see my MBP currently at 7806mAh (mstands Milli
which is 10 tothe -3 power) which translates to 7.806 Amp hours in non-techiespeak. As you see on mine Full Charge Capacity is 8.488 Amp hours.
Ok under healthyou see my cycle count is 17. Your very low cycle countreflects that you are not “conditioning” your battery by runningit on battery till 5 minute warning or going to sleep and then fullyrecharging it! You've had it ~18 mo. And your dooming yourbattery to a short life. Condition your battery for a long life.
Please notethis is a super battery 2.131 Amps @ 12.534Volts which Apple sayswill last 7 hours. Real world experience is significantly less withLion OS installed.
I am aregistered Apple Developer and sorta a hardware guru and builtmy first computer in the early '70's from scratch. I program also inmost languages but prefer CLI (Command Line Interface) through “AppleTerminal” which I program the actual i7 microprocessor and theGPU(Graphics Processor Unit) . Try the “terminal” but cautionwith the “sudo” command. Of course machine code, morespecifically, BSD(a flavor of UNIX) is what's under Apple's AQUA GUI(pronounced ”goo-ee”) is the (Graphical User Interface).
USAF Captain served as the Liaison Officer at Dallas Naval Air Station (now closed) and WISP (Wartime Information Security Program).
All of theabove and a dollar won't buy you a cup of coffee -=).
Let 'er rip and
cheers...

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Here's ehat i responded to another forum trooper:
Ok here aremy recommendations for your consideration:
Goto the “apple “on your top menu bar. Click 1stoption (About this Mac) a small screen will appear
andclick on “More Info...which will take to a large another smallscreen with Mac Book Pro in huge
letterslike this: MacBookPro.
Nextgo the “Systems Report” button: press.
NextUnder “Hardware” on the left you'll see “Power” click that.Volia the battery info
Nowlets do an analysis of the info: here's mine a 2 mo. Old 17” MBP:
ModelInformation:
SerialNumber:     ****************** (not shown by me)
Manufacturer:     DP
DeviceName:     ******************(not shown by me)
PackLot Code:     0
PCBLot Code:     0
FirmwareVersion:     406
HardwareRevision:     1
CellRevision:     1102
ChargeInformation:
ChargeRemaining (mAh):     7806
FullyCharged:     No
Charging:     Yes
FullCharge Capacity (mAh):     8488
HealthInformation:
CycleCount:     17
Condition:     Normal
BatteryInstalled:     Yes
Amperage(mA):     2131
Voltage(mV):     12534
OK under“Charge Information” you see my MBP currently at 7806mAh (mstands Milli
which is 10 tothe -3 power) which translates to 7.806 Amp hours in non-techiespeak. As you see on mine Full Charge Capacity is 8.488 Amp hours.
Ok under healthyou see my cycle count is 17. Your very low cycle countreflects that you are not “conditioning” your battery by runningit on battery till 5 minute warning or going to sleep and then fullyrecharging it! You've had it ~18 mo. And your dooming yourbattery to a short life. Condition your battery for a long life.
Please notethis is a super battery 2.131 Amps @ 12.534Volts which Apple says will last approximately 7 hours. Real world experience is significantly less with Lion OS installed.
I am aregistered Apple Developer and sorta a hardware guru and builtmy first computer in the early '70's from scratch. I program also inmost languages but prefer CLI (Command Line Interface) through “AppleTerminal” which I program the actual i7 microprocessor and theGPU(Graphics Processor Unit) . Try the “terminal” but cautionwith the “sudo” command. Of course machine code, morespecifically, BSD(a flavor of UNIX) is what's under Apple's AQUA GUI(pronounced ”goo-ee”) is the (Graphical User Interface).
USAF Captainserved the Liaison Officer at Dallas Naval Air Station (now closed)and WISP (Wartime Information Security Program) USAF Captain.
All of theabove and a dollar won't buy you a cup of coffee -=).
Let 'er rip and
cheers...

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Battery Information:
Model Information:
Serial Number: Sony-ASMB012-3824-3cb4
Manufacturer: Sony
Device name: ASMB012
Pack Lot Code: 0000
PCB Lot Code: 0000
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P.s sorry for my english.

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For how long should my MBP 13" battery last, in normal usage?

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