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.

Mine lasts several weeks. Also, it has a little light that turns red when it's low (as in, needs charging within a few days). It can also be used while charging without much issue. When I see the red light, I just plug it in while I'm not using it or doing something like watching media. It's really convenient. I have a mouse bungee, from when I had wired, and the cable just sits there waiting until it's needed.

My logitech wireless mice will run on a single AA for like ... 2 years of daily use, I wanna say? At least 18 months.

I've been using a wireless mouse at work now for over 12 years and can count on one hand the number of times I've had to change the batteries

Just to join the poll, my logitech mouse will do about 2 months per charge. When the battery is low, it wil indicate with a red LED, but it will keep going for several days (thoigh I've never had the issue with not finding a charger within that time, so I don't know how long it could run after the LED lights up).

The batts last around a year

The mouse I have is only wireless for the "less drag while gaming" aspect but the cable is actually super nice, so I dont even mind the cable... I just leave it plugged in now.

This is what I do. The mouse is plugged in most of the time but if I'm playing a game or working in like Photoshop, it comes off for the freedom of movement.