Normal CR's need a 48 hour lead time - how to enforce in tool?

Normal CR's need a 48 hour lead time - how to enforce in tool?

How are people enforcing lead times on normal CR's?  We have a rule that Normal CR's need a 48 hour lead time, otherwise it needs to be an emergency CR.

It would nice to add a condition in workflow - where Change type = Normal, and 'create date' is less than 48 hours from scheduled start time, switch 'change type' to Emergency.

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