Service Engine Soon Light '06 2.5

So after filling up our 2 week old '06 2.5S SE Altima...the service engine soon light came on. When I filled up, I turned the gas cap until it was clicking a few times...so I was suprised when it came on.

In the manual it says that it will go off after a few trips...as long as the condition no long exists...any idea on what number "a few trips" is?