Beautiful, inspiring, and very encouraging - BUT:

The final result shown here is by no means classic length.

Classic length means that the hair covers the behind entirely, with the ends almost touching the thighs.

As far as I know that is called "classic" because with most women of average proportions, that would roughly mean that their hair is half as long as their whole body from the top of their heads to their toes.

The model still has half a year or so to grow until she reaches classic length. What she shows here is tailbone length (just somewhere around the top of the behind).

If she sticks with it, she will soon have reached classic length, however, and it/she will look heavenly.