How long could pro 2014 mid battery last? Mine 4.5 hours.

It says on the website that

"In terms of battery life, Apple has rated the 13-inch MacBook Pro with Retina display at up to nine hours of wireless web, up to 9 hours of iTunes movie playback, and up to 30 days standby time. In our tests, the MacBook Pro could easily get through a full workday as advertised. In a more extreme battery test, streaming YouTube videos at maximum brightness, the notebook made it over six hours before shutting off."

I bought this macbook pro 2014 mid last week from Bust buy. Everything is good except battery life. Without intense use, it only last for about 4.5 hours.

Is this normal?

Thanks in advance.