What do I have to put in the template parameter window for a message parameter?

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Hello, I am trying to show a message after filling in a form that is based on multiple entities. Based on a attribute of one entity I want to show a pop-up message with the text: “you can expect an anwser within {1} hours”. Below you can see my Domain model. The blue circle is the duration attribute that, based on the subject that is chosen when creating a form, is shown in the message. What line do I have t put in the “template parameter (string)” window? PS: I am a beginner with using mendix, for my internship I am performing a Proof of Concept. Thanks for responding :)
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1 answers
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toString($Subject/Subject_duration)

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