Datediff for duration

Helllo Anonymous 

if you need a solution in power query, add a new colunn and use this formula

Number.Round(Duration.TotalHours([EndDateTime]-[BeginDateTime]), 2)

Here the complete example

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjLQMzTUMzJQMDSwMjFT0lEyMoUKGJhbGZorxcYCAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [BeginDateTime = _t, EndDateTime = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"BeginDateTime", type datetime}, {"EndDateTime", type datetime}}, "de-DE"),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Duration in hours", each Number.Round(Duration.TotalHours([EndDateTime]-[BeginDateTime]), 2), type number)
in
    #"Added Custom"

Copy paste this code to the advanced editor in a new blank query to see how the solution works.

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Kudoes are nice too

Have fun

Jimmy