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It’s actually about 155 30 second exposures blended, using a [common technique for getting star trails](http://digital-photography-school.com/better-star-trails-photographs-with-starstax/) that also works for getting headlamps for the same reason.
Each individual shot was 30 seconds @ f/2.8, ISO 400, 55mm. When I set up the camera I did a few test shots to make sure the exposure was right. Then after everything was blended in post processing, the trees and rocks were super blotchy because of the blending technique and my tripod isn’t 100% stable for 75 minutes. So I brushed in one of the single images, leaving the star trails and headlamp trail intact.