[Solved] What does it mean that the next DAG is in X days?

Serj Sagan Asks: What does it mean that the next DAG is in X days?
Before you jump all over this a duplicate question. I did read things related to DAG like here: What actually is a DAG? But that doesn’t answer my question, what does it mean when my mining pool website says that the next DAG is in X (4 in my case) days? How does that affect me as a miner?

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