Another Duration Expression Question - Covert Text Value to Duration?

[mykrobinson]

In the call/contact log app i'm creating, I have added "Text" as a communication method, and I want to duration to automatically be set to one minute if Text is the method.

[Duration] is a "duration" column type.

How do i properly convert the value that i am wanting to the "duration" type? What's the proper method for correcting this expression?

Thanks