How fast is your credit score affected by changes in credit utilization?

Basically, how current is the credit agencies records?

Under normal conditions, my credit utilizaiton varies wildly.

When applying for credit, I generally want 10-20% credit utilization. I can make that happen, but I wanted to know:

How long after I make it 10-20% should I apply for credit?
How long do I need to hold my credit utilization at 10-20%?

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