G'day David,
as it's spring and bobweight affair the advance should be linear. EG 0 rpm = 0 adv, 1000 rpm = 10 deg adv, 2000 rpm = 20 deg adv, 3000 rpm = 30 deg adv. These figures are example only, not sure of exact. Modern bikes with elec ign have more of a curve and also vacume and temp figures into the equation.
Full adv at 4000 rpm should be 32-35 deg, at idle about 10 deg.
Cheers