How Long Does It Take for Hypopigmentation Spots to Go Away After a Photofacial?

I am about 18 or 19 days post photofacial/photorejuvenation. My hyperpigmention is gone and most of my hypopigmented spots are blending in with the rest of my skin. However, I have two laser shaped lighter spots on my forehead temple. These areas were definitely the most traumatized after the procedure. They seem to be getting better, but I want to know how long it usually takes for hypopigmented spots to color up after the procedure. I am very concerned they will never go back to normal.