Automatically export graphs for all the time series in a given data.frame, column by column, every X data points

Not at all!

See this recent thread. Basically, the approach is to prepare a code snippet to do a single plot, convert that code into a function and then map that function to list Pz1 ... Pz_n as arguments to the function.

Can you repost with a reprex? See the FAQ: How to do a minimal reproducible example reprex for beginners. We can help composing the function from the example, if needed, and then the mapping function.

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