Oh dear...that could get realllly old.
What's fun are the ones that will keep going as the battery goes, but the pitch of the voices goes down until the thing dies. My sister had a doll that would say things like "Mama" and giggle...my brothers would intentionally put old batteries in it. Sounded like a horrible crazy man. "Maaaaammmaaa...huhhhuhhhuhhh..."
There are a couple of toys like that in their room now. :-D
I try to delay replacing batteries when I can. But Alyson will now march right up to me and say "Mommy! Batteries, pleeeease."