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FUN FACT: Due to a longstanding bug in the Bitcoin source code, the time spent mining the first block in each difficulty epoch actually has no effect on the next difficulty calculation. Even if this block somehow took an entire year to mine, it would not cause the next difficulty to drop, believe it or not! The calculations on this site take this bug into account to help produce the most accurate difficulty estimate possible. For more information on this bug, please refer to this section of Andreas Antonopoulos's book, Mastering Bitcoin.