The CRM workflow designer provides a property called "Execution Time" which can be used in dynamic expressions such as "if Account(CreatedOn) + 10 days < workflow(ExecutionTime)". The meaning of this property is neither the time at which the workflow is published nor the time the workflow instance starts. The actual value of this property is the real time when the workflow evaluates an expression that contains this property. Therefore, expressions such as "Wait until 1 day after workflow(ExecutionTime)" will never succeed and the workflow will wait and resume once a day forever causing performance problems. If you want your workflow to wait for a specific amount of time you should use the wait step and configure the condition as: workflow – timeout – equals – {Duation}. This will unload the workflow and resume execution after the specified time duration has passed.
Reference
http://blogs.msdn.com/b/crm/archive/2010/01/15/microsoft-dynamics-crm-workflow-authoring-best-practices.aspx
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