Dark spots after Q switched laser. How long should I give them to fade before I consider it a problem?

I had Q Switched laser for brown spots on my legs a month ago. It took over 2 weeks for the scabs to fall off. Now the spots have been replaced by vey dark pink spots. I am very fair. The spots may be fading but vey very slowly. How long should I give them to fade before I consider it a problem? Also, is there something I can do to expedite the process?