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Current Difficulty 27.497

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Expected Time per Block 0 day(s), 0 hour(s), 2 min, 46 sec

Above is propably right, so if time for solving a block is 2min 46sec, (it's more than 2min 30sec, which is target block solving time) that means difficulty is going DOWN, not up like it is shown in your calculator:

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Next Difficulty 34.665613350126

Next difficulty = (2min 30sec)/(2min 46sec)*27.497

Next difficulty =

**24.846**