Cleaning 90 squares takes about an hour. Pretty quiet and doesn't get in the way. The child is delighted with it and tries to play with it. Like all robots, he likes to get tangled in wires and long curtains, after which he demands attention. I am satisfied with the purchase. In excellent Its pros: Convenient vacuum cleaner. Unlike cheap models, it does not drive randomly, but builds a map. He always knows where he finished cleaning (if necessary, the container returns to the base, after cleaning, it returns to the last cleaning point). Unlike simple models, it has 2 silicone rollers, and not just a pipe for suction of debris. Has cons: - If run 1 time in 2 days, it is removed only in places of pollution that it found last time. In other words, it does not go to all rooms.