How long til my natural skin color comes back around my neck area or heal?

Hispanic-Cool-Guy
I'm getting ready for church this morning and when I went to look in the mirror I see my neck area almost completely burnt and totally different shade than my natural color when I never noticed it before til this morning.

I noticed my arms getting darker because of the sun I endure while I exercise outdoor 5 times a week but my neck took me by surprise.
How long til my natural skin color comes back around my neck area or heal?
How long til my natural skin color comes back around my neck area or heal?
Updates
+1 y
I'm done excersing in the sun for now.
How long til my natural skin color comes back around my neck area or heal?
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