My laptop's wireless mouse has used the same AAA battery for months, and it gets used regularly. It's not daily, but it's at least a few times a week for an hour, and usually a lot more.

My wired mouse on my PC gets used about the same amount, but the cable occasionally catches under the corner of the keyboard. It's not helped by the fact that I move the keyboard around depending on what I'm doing. That's also the reason I'm considering a wireless keyboard as well though.