I have a request where they want an individual to add a work task. Then when they go back to edit the record and mark it complete they want to be able to see how long it took them to complete the task. The time difference needs to show on the Nintex form as soon as the Task Completed is marked.

I have not been successful on figuring how to display the time difference immediately. I have been able to save the record and then edit it again and the time difference shows. But for my requirements, once they check the task completed then they can no longer edit the record. They want to be able to view it on the form while in edit mode.

Any help would greatly be appreciated!
Thank you, Marilyn