The duration of T-tube placement after bile duct stone surgery varies according to each patient. In general, the T-tube is normally removed after 4 weeks of placement. If the patient has residual stones, etc., the extraction time is extended to about 8 weeks. 1. Normal extubation time: In theory, the patient can have an angiogram after 14 days and try to extubate 24 hours after the angiogram shows that the bile duct is open. However, for the sake of safety, physicians will choose to pull out the tube after 4 weeks, and for laparoscopic surgery patients, this time will be extended appropriately. 2. Extraction time in case of residual bile duct stones: For patients with residual bile duct stones, biliary tract inflammation, stenosis has not been lifted. After 8 weeks, the fibrous sinus tract is formed through the T-tube, and then choledochoscopy and stone removal are carried out through the sinus tract, or the narrow bile duct is dilated through interventional methods. For patients with T-tubes placed after gallstone surgery, they should follow the doctor’s instructions and should not pull out the tube early against the doctor’s advice, otherwise it may cause serious consequences. If the T-tube is accidentally dislodged during the placement process, the patient should immediately go to a specialized physician in a regular hospital for treatment.