However, we do know that The Starry Night was not Vincent van Gogh's first attempt at painting the night's sky, and by comparing the work to the earlier painting Starry Night Over the Rhone, one is able to make several inferences about how van Gogh felt by this point of his life.
Hair grows about 1/2 inch per month. If the rest of the scalp hair is long, it may take months or years before a shaved area grows sufficiently to match the rest of the hair. After shaving, the hair growing back may appear to be thicker and coarser, because the shaving process removes the natural thin ends of the hair.
If you have unhealthy hair, then it will take about one to two months to grow a little but if you have healthy hair, then it will take about one month or so to start growing a little. In terms of it being long, it will take a good few months to a year to notice it being a lot longer.