With a properly adjusted timer how far should it move from fully retarded to full advance?
About 83.5 degrees.
And.... considering a timer housing has a diameter of 3.000" the circumference is 9.424" which represents 720 crank shaft degrees (2:1 Crank to CAM gear ratio). So, 83.5 crank shaft degrees would be 9.424*83.5/720 = 1.093" of physical rotational travel; fully retarded to fully advanced.
I have come across cars with as little as 0.75" of travel due to worn out and mis-adjusted pull rod linkages.