Answer: The duration of the regeneration of a column in the DUPLEX-PRO 1.25" softening system varies depending on the specific model and the set parameters of the system. In general, however, one can assume the following: Average regeneration time: Regeneration of a column in a water softening system such as the DUPLEX-PRO 1.25" typically takes between 60 to 120 minutes (depending on capacity). Different phases of regeneration: The regeneration process includes several phases - backwashing the resin, loading with saline, slow rinsing (refilling) and fast rinsing. The duration of each phase can vary depending on the system settings and the water hardness. Automatic Process: Regeneration is typically carried out automatically by the system controller based on water consumption or a pre-programmed schedule. To determine the exact duration of regeneration for your specific DUPLEX-PRO 1.25" system, please download the data sheet.