The time of ovarian cancer formation is mainly related to the type of ovarian cancer, and the exact time varies from person to person and cannot be generalized. In case of ovarian tumors with higher malignancy, patients may have a shorter onset time and symptoms will appear soon, such as rapid growth within one year, forming abdominal masses and abdominal pain. Since this disease can lead to endocrine disorders, patients may also show menstrual disorders, amenorrhea, irregular vaginal bleeding and other manifestations, and the onset time is usually 1-2 years. In the case of less malignant ovarian tumors, such as junctional tumors and germinal tumors, which take a long time to grow and are discovered late, it usually takes 10-20 years for the onset of the disease to transform from precancerous lesions to true malignant tumors. In conclusion, if the tumor is highly malignant, the formation time of ovarian cancer is shorter; if the tumor is less malignant, the formation time of ovarian cancer is longer. Therefore, patients are advised to visit the gynecology or oncology departments of regular hospitals for a clear diagnosis and timely symptomatic treatment.