There is no delay script method in Vijeo Designer.  It is not recommended to create a loop as a workaround since it can make the HMI very slow and effect the communication or even lock up the HMI
If you are calling the script from a switch , you can split your script in half and add a delay operation.  This delay operation is only available from a switch operation.  So if the script is called from a local or global action it cannot be done.

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