Hi there, i'm fairly new to workflows and am seeking guidance. I'm trying to send out a customer survey email, that looks at Sales Orders that were fully billed 'x' days ago. I only want one email to go to a Customer, based on a particular Sales Order and I need to ensure they do not receive another email within 30 days from the last email sent (if they got one). Furthermore, the email must send to the specific email address captured on the Sales Order. I have created a custom field on the Customer record ("Survey Last Sent Date") and in my Workflow, for my 1st Action, I want to set a condition that checks the Survey Last Send Date and if empty or date is greater than last 30 days, it can proceed. I don't seem to be able to set the condition using the Visual Builder and my formula knowledge is very limited! Can anyone shed any light on how I can achieve this?