I don't have any small kids to keep an eye on. But I have an older pup. I know where she is at all times, kind of like an automatic radar, just that I am aware when she goes out to pee, when she disappears for a few minutes it's like hearing the kids go silent, you know they're up to something. It's not as though I lose my concentration on my hobbies, my chores, my reading, my gardening. Just that when you love someone, or some furbaby they are just part of you, an extension, it feels like part of my body is missing if she wanders away. I can't imagine losing track of my pup for 3 minutes.
Three hours?