Dating Mees' Lines

I looked up the average for nail growth and it's 6 months to grow from base to tip.

My Mee's lines would date back about 5 1/2 months. Around April. Which could put me in Wenatchee or possibly back East. I think. If Mees makes the mark at the time and then grows out.

If something happened recently, I can't see any evidence in the nail yet though I have the raindrop hypopigmentation on my arm which is brand new.

I am going to see what other things might cause this pattern of hypopigmentation.