Formula to add up billable hours from a certain date range

Hi community! I’m trying to learn airtable: am not a total newbie, but still struggle with formulas. I need a formula (I think) to add up billable hours. How do I tell airtable to ONLY add up hours from any given month? The contractor enters the billable time in a number field and the date on which the hours were worked in a date field.

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