I use 3 weeks. A long-haired cat and an apartment that is 47 square meters in size, with all of the furnishings. I run it every other day at maximum suction and maximum water (after wetting a cloth for wet cleaning), and I do this after every wet cleaning. Water is the perfect amount. The charge is still approximately 17%. Dust container, must be filled approximately one fourth of the way with crushed wool every two days. An outstanding woolen sausage is produced as a result. The cat does not run away from the device in the same way that it would from a regular vacuum cleaner; rather, it simply dislikes it.