Result of Interval is text and not number

[#1]

Hello;

I am trying to get the average of month per contract.

This is the formula used:

num#((num#(round((num#(Interval([Contract End Date]-[Contract Start Date],'dd')/365)*12))))/Count (DISTINCT Contract))

Even using the num#, it never provided a number in the total of the expression.

What to do in this case?

Thanks

Kristel.

[#2]

Unfortunately this did not provide any result.

Not sure why???

Thanks for the effort