Convert a Duration to Total Hours in Power Query M

Converts a Duration value, like the difference between two datetimes, into a decimal number of hours.

Data TypesIntermediatedurationhourstimeconvert

Power Query M code

let
    Source = YourTable,
    AddedDuration = Table.AddColumn(Source, "DurationHours", each Duration.TotalHours([EndTime] - [StartTime]), type number)
in
    AddedDuration

Notes

Use Duration.TotalMinutes or Duration.TotalDays instead if you need a different unit.

Requirements

How to use this snippet

  1. In Power BI Desktop, choose Transform data to open Power Query, then open the Advanced Editor on a query (or start from a blank query).
  2. Paste the snippet and replace the placeholder names (tables, columns, file paths) with your own. Check the requirements above first.
  3. Run it through the Power Query M Formatter to tidy the layout.

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