With my Nikon D7200 a battery lasts a few months in normal casual use. Even in tourist mode it'll last over a week or three. As I type this, I'm on week four of a trip away from home and still have over 50% charge left from when I charged it up at home.

Being the photo geek in my circles, I occasionally get asked to be an event photographer for some activities. In those days I'll take on the order of a thousand photos in a day, and that doesn't come close to using up a battery.

Battery life on DSLRs is almost miraculous, I love it.