How long does golden hour last in Longyearbyen?
Around 205 to 212 minutes each evening. It's shortest in September, about 205 minutes, and longest in March, about 212 minutes. In April, May, June, July and August there's no ordinary evening window: the sun stays high through the night. In January, February, October, November and December the sun stays low all day, so the gold merges into one long window or doesn't come at all. The farther from the equator, the longer it lasts, because the sun crosses the horizon at a shallower angle.