Hi Julie,
Unfortunately taking hormones does not have a dramatic effect on facial hair growth. The only way of removing testosterone totally from the body is to remove the testes. Yes the rest of the body does benefit and I was body hair free after a year on hormones.
Estrogen plus an anti-androgen (Androcur, Spironolactone) have a combined effect on Testostrerone by supressing the levels in the body but you cannot stop production only reduce the overall level. The anti-androgen is required to block the testosterone,otherwise the free estrogen in the body is swamped by the testosterone and feminization is reduced.
Facial hair is one of the Male secondary sex characteristics and once established needs very little testosterone to grow, taking hormones may slow this down.
Like Tinkerbell I was nearly 300 hours as it may take many treatments of the same hair until the blood supply is finally stopped.Each treatment will weaken a hair and it grows back finner until finally killed.
Buffy