Time difference between 2 dates not calculating when over 24hrs

Hello Smudgers9 

In that case represent your column using below DAX. Even though its text create a measure for the average duration calculation as well. 
Firstly create a column like this:

Time Format = 
Var Days_diff = DATEDIFF('Table'[Date Logged],'Table'[Date Resolved],DAY)
Var Hours_diff = DATEDIFF('Table'[Date Logged],'Table'[Date Resolved],HOUR)
Var Total_Hours = Days_diff*24
Return
IF(Hours_diff<24, "0 hours + "&
FORMAT(Time(HOUR('Table'[Date Resolved]-'Table'[Date Logged]),
MINUTE('Table'[Date Resolved]-'Table'[Date Logged]),
SECOND('Table'[Date Resolved]-'Table'[Date Logged])),"HH:MM:SS"),
Total_Hours & " hours + "&
FORMAT(Time(HOUR('Table'[Date Resolved]-'Table'[Date Logged]),
MINUTE('Table'[Date Resolved]-'Table'[Date Logged]),
SECOND('Table'[Date Resolved]-'Table'[Date Logged])),"HH:MM:SS"))

Output looks as below:

Then your measure looks as below:

Average Duration = 
FORMAT(AVERAGEX('Table','Table'[Date Resolved]-'Table'[Date Logged]),"HH:MM:SS")

Output looks as below:

Because of the time constrains I have not validated so please validate solution. 

Note: In Power BI, the time data type is designed to handle times of the day, which means it cannot natively handle intervals that exceed 24 hours without rolling over. The built-in time data type will interpret '53:19:00' as '5:19:00 AM' of the next day because it is 53 hours and 19 minutes past a certain start point

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