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I have the following time series: enter image description here

As you can see, there is a seasonal factor (those are daily data with a sampling frequency of 1 minute). Which we can see in this acf plot (4 days worth of data):

enter image description here

I want to fit an ARIMA model on this data, but should I care of the seasonal component first (the data is stationary)? In R, the arima function does not support a period exceeding 350.

Thank you all!

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