The time to develop cancer in benign ovarian tumors varies from person to person, most of them will not become cancerous, while a few may take years or decades to develop cancer. The time to cancer is influenced by many factors, such as cell mutation, regularity of work and rest, regularity of diet, or exposure to cancer-prone substances. Some benign ovarian tumors can become malignant, while others do not. The histological types of ovarian tumors are complex, and it is impossible to determine when or if a benign ovarian tumor will become malignant. It is important to note that once a benign ovarian tumor is diagnosed, it must be reviewed regularly by ultrasound according to the doctor’s orders, and it may be necessary to check tumor markers or MRI to clarify the development rate of the ovarian tumor and whether there is any malignancy, and if necessary, surgical removal.