trez is right... management for TB takes 6-12 mos depending on the severity of the disease... however typical therapy is done 6-9mos..
a repeat sputum exam is done after 2 mos (usually to check the effectiveness of therapy), if it turns out negative treatment is still continued until 4 mos using double therapy.. if it sputum turns out positive after 2mos then a repeat quadruple therapy for 4 mos is done (if sputum turns out to be MDR-TB (multi drug resistant TB) additiional drugs are employed .. if its not MDR-TB and the the patient is stubborn not to take the drug or skipping the drug then repeat of 2 mos therapy is done)
the spot you see in chest x-ray will be permanent, it is the scar done by disease...
an advice for effective TB management is to bring the patient to a TB-DOTS center, may free na anti-Tb drug (cause the drugs are so expensive for a 6mos treatment) and its an effective management for TB