@mpjgregoire so, I think the distinction here is between the "head of state" and the "head of government".
https://en.wikipedia.org/wiki/Head_of_state?wprov=sfla1
https://en.wikipedia.org/wiki/Head_of_government?wprov=sfla1
I guess the question doesn't specify which I meant, except in the implication that there might be some limit possible, which isn't the case with hereditary monarchy.