If the endometrial cancer is caught in time and treated in a timely manner then it can almost always be cured and then the person can live a normal life expectancy.
But if not treated or the cancer is not cured then the person may live from 5 to 10 years after diagnoses of the endometrial cancer.
If the person is treated for the cancer and lives after 5 years after the cancer treatment then it's likely the person has been cured of the endometrial cancer.