Frequency Distribution

I want to plot the frequency distribution of a variable according to its occurrence for a specific time spanning over 5 years. The data is a currency price feed, I have datetime ask bid and spread over a million records - Now I want to lay down a criteria for the spread in terms of, high low medium and then see the number of occurrences in terms of high low medium over in time categories over 5 years?

Can you make a reproducible example with a small amount of data and an example of the kind of output you want?

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