On page 273 in your manual, battery life is discussed. Go with the Nikon standard as the CIPA standard is a brutal test. The Nikon standard is closer to reality for a DSLR. If you don't have your manual, download from Nikon's web site.
On my D7000, I get about 1000 shots on a charge which is enough to last me 3 to 4 weeks on a trip to the bush. I only shoot stills and rarely use live view unless shooting studio or macro for critical focusing. The thing that eats up batteries is using the LCD screen. Reviewing photos on the camera's LCD screen, using live view, and shooting video will burn up batteries.
If you're asking the total lifetime of a battery, my D40 battery is still in good shape after 10 years, although the D40 doesn't get much use these days. My D7000 batteries (I have two) are still good after 5 years.