For patients with malignant breast tumors who are treated with breast-conserving surgery, the operation time tends to be around one hour to one and a half hours, including the time of anesthesia and waking up after anesthesia, and may also reach more than two hours in severe cases. Breast conservation surgery refers to the removal of a segment of the breast or removal of a breast lump while preserving the remaining breast, also known as breast conservation surgery. For most breast cancer patients, the procedure is usually based on a modified radical breast cancer surgery followed by axillary lymph node dissection, which typically takes between one hour and one and a half hours. For breast cancer to be breast-conserving, firstly, the patient’s breast tumor lesion should be relatively small, and secondly, there is no metastasis in the axillary lymph nodes or no metastasis is found in the sentinel lymph node examination. If the patient’s breast tumor lesion is relatively large or the axillary lymph nodes are enlarged, it is not recommended to do breast-conserving surgery.