It varies with use, but they generally don't last nearly as long as they should. However, the VMU is flash/EEPROM-based, which means that you don't lose your data when the batteries die.
one thing i would recommend, having seen 2 people with ruined vmu screens, is once the batteries die, remove them, even if your not going to replace them, it will work fine without them for game saves, but just prevents them leaking inside the vmu
As to VMUs: TAKE THEM OUT OF THE CONTROLLER when you are not using them. And the batteries are really only used for mini-games, like Chao raising and whatnot for Sonic.
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