Hi Tess,
I noticed considerable reduction in beard growth after two or three sessions. It sounds like things are coming along for you, though. The length of the hair is not important, in fact a close shave is preferred for laser. The effectiveness of the treatment depends on zapping the hair follicles during the anagen phase of the growth cycle, when there is the most melanin in the root. Unfortunately there is no way to tell, and your hairs are all on their own cycles, so it is luck of the draw which ones are effectively destroyed.
Terri