Figuring hours/min from 2 timedate fields

I have a start field and end field that are timedate fields. For a service call i would select the start time when i arrive, when finished i select the end time. I want to populate a 3rd field (InvoiceTime) with the minutes between the 2 timedate fields for invoicing since i invoice by the hour.

Start 11/8/2019 1:20:00 PM   End 11/8/2019 2:20:00 PM  InvoiceTime 60

Is there a way to do this with a formula??

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