How long can you live if you have leukemia?

That depends.: There are many different kinds of leukemia. Some are curable, some can be controlled so well the patient has a normal lifespan, others are slow growing with survival over a decade. The acute leukemias are the dangerous ones, with rapid onset, high risk of death if not successfully controlled with chemotherapy and/or stem cell transplant. Even then, some of these patients can be cured.

It depends...: The prognosis of leukemia is highly variable function of multiple factors including type of leukemia, age of the patient, stage of disease, coexisting illnesses, etc. Many types of leukemia are treatable with subsequent long remission or even cure.