The amount of exercise that is safe for cancer patients can vary. The American Cancer Society recommends that cancer patients aim to engage in at least 150 minutes of moderate-intensity or 75 minutes of vigorous-intensity activity each week, along with two days of strength training. However, this can be adjusted based on the patient's physical condition and treatment side effects. It's essential for patients to listen to their bodies and avoid overexertion. Starting with shorter, more manageable periods of activity and gradually increasing duration and intensity is often a good strategy.