How often should I be tested for MAC

I was diagnosed with bronchiectasis last July, 2024 and at the time the doctor did a lung lavage and started a culture for infections. After a couple of weeks he told he I did not have any infections and he was happy about that, said I avoided antibiotics taking for a year or so. My question now is how often should cultures like that be run? I have not had any since last July. My mucus color is either light yellow or light green and frankly, it is lighter than before I started saline, etc.