There is no authoritative information on how long it takes for a glioblastoma to form; in general, glioblastomas with a high degree of malignancy take a short time to form. Low malignancy glioblastomas take longer to form. The formation time of glioblastoma is related to its malignant degree, if the malignant degree of glioblastoma is high, the growth rate is faster, the formation time will be shorter. If the degree of malignancy of glioblastoma is low, the growth rate is relatively slow, the formation time may be longer, but at present there is no accurate data to show the specific growth time of glioblastoma. It is recommended that patients seek timely medical attention when glioblastoma develops, and doctors will determine the time of tumor formation based on the growth rate of the tumor. In addition, patients with glioblastoma need to choose appropriate measures for treatment under the guidance of doctors, and common treatment modalities include surgical treatment, radiotherapy, chemotherapy and so on.