I began a calcium/magnesium supplement program, how long before i notice the full effects?

Depends: Why are you on the program? I recommend a 1:1 dosage--i.e., equal amounts of calcium and magnesium. The dosage is determined by your bowel tolerance--i.e., the dosage that gives you diarrhea or loose stools. Just reduce the dosage to what is comfortable for you. Excess calcium impairs magnesium absorption--and inadequate magnesium impairs calcium absorption.