This takes a few hours to distill a gallon of water. It is what it is. If you're trying to distill gallon after gallon you'll be on the clock all the time. It has to be cleaned after each use to break away the deposits left from running it. I use the water for my plants and my humidifier so it's hard to keep up with having enough for both. All in all, I like it and am glad I purchased it. It works as intended.