Right, the difficulty adjustment is trying to keep it so the network as a whole generates an average of 6 blocks per hour. The time for your block to mature will always be around 20 hours. The recent adjustment put us back to close to 6 blocks per hour again. There's a site where you can see the time between blocks, and since block 68545, it's been more like 10 minutes per block: http://nullvoid.org/bitcoin/statistix.php
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