Installing a water softener doesnโt take too long when a professional technician is completing the installation. As long as no unforeseen setbacks or problems are encountered, a professional plumber should be able to install a water softener in about two to three hours. Choosing to have your water softener installed by an expert is a good idea, as this will ensure that it is installed and working properly, helping to prevent problems down the road. In addition, water softeners are available in various makes and models and an experienced technician can help you find the best system for your home and your family.