Knee replacement surgery typically takes 1 to 2 hours to complete, depending on the complexity of the procedure and whether it's a partial knee replacement or a total knee replacement. Partial knee replacement: This procedure is generally quicker, often taking about 1 to 1.5 hours, as it involves replacing only the damaged portion of the knee joint. Total knee replacement: This procedure is a bit more involved and can take about 1.5 to 2 hours as it requires replacing the entire knee joint. Factors like the patient's overall health, the surgical approach, and any complications that may arise can also affect the duration of the surgery. After the procedure, patients usually spend a few hours in recovery before being moved to a regular room to begin the healing process.