Took me about a week to read, it wasn't too much of a commitment, but it touched on many topics of interest. Truthfully - I skipped over the essay where he was comparing himself to Freud because I don't really care about that right now.
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I've recently picked up a book of lectures which are meant to aid you through the Mysterium Coniunctionis. If you're into Jungian dream analysis and want to know more about alchemical symbols, I would check this one out. It's by the accomplished Jungian scholar Edward F. Edinger.