RE: How to create a workflow to run 45 days from Estimated Start Date field?
Hi USA80,
From your screenshot, you have set a wait condition for copied field.
A wait condition tells the workflow to wait until some specific action has occurred, such as a field changing or updating to a specific value.
But the workflow just stays in a waiting status, can you answer following questions:
(1) Have you checked the value of the calculated field and copied field?
(2) Copied field’s value is whether it is equal to the value set in the workflow?
(3) What way you are using to copy calculated field value to another field?
Also, do you know the Timeout?
A Process Timeout tells the Workflow to wait for a specific amount of time or until a specific date. The former is essential for building workflows that should space out the execution of certain steps while remaining fully automated, while the latter is needed when a given step has to execute on a certain day or time. You can include a Process Timeout in a workflow by selecting Add Step > Wait Condition, and then adjusting the values as shown here:

It is very good but has a small flaw, the number of days cannot be set beyond 31, which makes it inapplicable to the current scenario
Regards,
Leah Ju
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