The time it takes for coconut oil to remove dark spots depends on how severe the dark spots are.
But for me it took around 10 days to start seeing the dark spots on my face disappear when using coconut oil on the dark spots.
After a month the dark spots were nearly gone and after 2 months of using coconut oil on the dark spots the dark spots were fully gone.
I then continued to use coconut oil on my skin to help keep the dark spots from appearing again.
As long as you continue to use coconut oil daily on your dark spots you should see them disappear within at least a month.
Some people see the dark spots disappear sooner but it can vary from person to person.