What assumptions do we make when using a constant dividend growth model? Assuming a stock has dividends that grow at a constant rate of $3\%$ forever, if you value the stock using the constant dividend growth model, how many years' worth of dividends constitutes one$-$third of the stock$$s current price?

You may calculate the time required in terms of variables such as initial dividend $($D$)$ and discount rate $($r$).$ The information on growth rate $(3\%)$ is given in the problem.