Final answer:
The duration of Jeffrey's chemotherapy is not specified in the provided information. Chemotherapy treatment duration can vary widely based on many factors. A compromised immune system from leukemia and chemotherapy can lead to severe complications.
Step-by-step explanation:
The information provided does not include specific details about the duration of Jeffrey's chemotherapy treatment. Instead, it focuses on the condition called Chronic Myeloid Leukemia (CML), its effects on the immune system, and how chemotherapy can weaken immunity leading to increased susceptibility to infections. When undergoing chemotherapy for any leukemia, including CML, the treatment duration can vary based on several factors including the type and stage of cancer, the patient's response to treatment, and the specific treatment protocol prescribed by oncologists. In general, chemotherapy can last for several months to a few years, administered in cycles with periods of treatment followed by periods of rest. Benjamin's case highlights how a compromised immune system by both leukemia and chemotherapy can lead to severe complications such as bacterial pneumonia which can be fatal if not managed effectively.