If you get sprayed in the face with pepper spray the pepper spray will cause temporary blindness for 15 or 30 minutes.
The a burning sensation will continue for 45 to even as long as 60 minutes especially if you don't wash the pepper spray off.
You can help neutralize the pepper spray and make the burning go away sooner by soaking a towel in milk and lay it over the skin.
The milk will get rid of the pepper spray burning.
You should always wash your eyes out with some running water or a bottle of water right after getting sprayed with the pepper spray.