How long can someone with metastatic breast cancer with severe ascites (5 ltrs every 14 days) have to live?

See your doc: Unfortunately, questions like this can't be intelligently answered without seeing the patient and knowing more abour her (age, general health, etc.) in general, however, this situation implies a very poor prognosis.

Sounds bad: It depends on the treatment options available for this patient.Patients with metastatic breast cancer do have multiple treatmetn options which can extend their life for 2-3 years. But if this patient has already used up all options of treatment , then she may get into serious trouble in a matter of few weeks. We can not be exact in predicting survival without knowing the details of all treatments.