CDP hole punching speed

[Ryltar]

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I'm getting kind of frustrated with CDP hole punching, as I seem to be kind of slow at it. In 10 minutes I can correctly solve 11-12 on average, without getting to the rest of the problems, and I'm not making any mistakes. I'm using the grid method only for the harder ones.

How long do the DAT hole punching problems take vs. the CDP hole punching?

Thanks.