That the speed of light will remain constant I can understand...sort of. But the time it takes for that light from the original point to the various observers, to my HS graduate thinking, should vary dependent upon distance from that original point.
and it does. At least according to current ways of thinking. This is how we measure distance to stars. Light DOES take a different amount of time to cover different distances and the same amount of time to cover the same “distance” if distance continues to mean anything constant.