How long can i be in the noonday sun before my skin will burn?

Sun sensitivity: The fitzpatrick scale (aka fitzpatrick skin typing test or fitzpatrick phototyping scale) is a numerical classification schema for the color of skin. It was developed in 1975 by thomas b. Fitzpatrick, a harvard dermatologist, as a way to classify the response of different types of skin to uv light. It remains a recognized tool for dermatologic research into the color of skin. Where are you on scal.