The green flash only lasts a few seconds in central latitudes. However in the polar regions where the sun slowly changes in elevation, it can last much longer. Members of a polar expedition in Antartica reported seeing the green flash for 35 minutes in September as the sun slowly rose above the horizon, signifying the beginning of summer.

On a side note, there is an old Scottish legend that says if you see the green flash, you will not err in the matters of love.