Andy just commented on this on the frequentdose chelation yahoo group. He made it sound like you could chelate indefinitely. He said he wasn't as worried about copper buildup as he was when he wrote Amalgam
My son does better on ALA days also. We have recently gone from weekends to weekdays ON and weekends OFF.
We have done two week rounds....only thing is.....the longer rounds, candida tends to become a problem for us....so we end up using antifungals toward the end of the round. But, he is the point now that he recovers fairly quickly from the candida attack.