Insulin can be given for 30 years, or even for a lifetime. For example, type I diabetic patients need insulin from the time of diagnosis because of a complete lack of insulin, and there are some type I diabetic patients who have been diagnosed with diabetes since they were a few years old, and are required to take insulin for a lifetime. Insulin itself is an endogenous substance produced by the pancreas due to the islets, and insulin is given to supplement the lack of endogenous insulin in the body. The side effects are hypoglycemia and obesity if you take too much insulin, but there are no other side effects. If the condition requires it, insulin can be used all the time and there is no need to worry excessively, only to pay attention to monitoring blood sugar during insulin and not to cause hypoglycemia.