How long does a robot vacuum need to clean 1,200 square feet before the baby wakes up?

A hundred minutes of runtime cleans a 1,200-square-foot downstairs and gets the robot back to its dock before the baby wakes from a nap. That’s the real metric that matters — not the raw number, but whether it can finish the job while you’re doing something else. A robot vacuum is only useful if it finishes before you notice it started.