Me and motormouth kitty are happy
That's a great question I hadn't even thought about.
One dose should kill it but it should take 4-6 days for it to die. From what I understand the smell of a few dead mice is better than the smell of many dead mice pooping, peeing, feeding and breeding.
When I was a kid and we used poison on rats one got in the walls and died. It stunk to high heaven! But they were river rats and there were about the size of a small cat. Mice are much smaller and wouldn't smell for long or that much.