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Between 4-20 seconds. It's usually pretty quick once you have set up everything. It takes around 10-20 minutes to make a picture, and that's a ready to frame/hang on the wall photo.

Well, 20 secs don't sound too long. I read somewhere that people were so serious in old photos because of the shooting process, so I imagined something really really long. Anyway, it's amazing how your photos look like those taken in the 19th century. Great work!