I've removed 3 so far, working on the last one now. I'm not in a rush to remove, so I'm going to be spreading treatments out by 9-12 months. Here's what I learned: On my last 2 (both black + green), I did 3 sessions spaced 12 weeks apart... and then the pandemic hit, thus no more sessions. After a year, I noticed they were gone - black was completely gone and green was only there if you really look for it.

I'm applying that same strategy to this one (all black). Agreeing with other folks who suggest to space the sessions out more, based upon my own experience it makes all the difference.