Hello @alexisdg
Welcome to the DocuSign Community!
I had a same query on the “Last X days” and I raise the case to DS support. I got the answer, hope it helps you.
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This functionality should be used when it is necessary to check whether a specific date is within the scope of the last X days.
Basically, what this Last X Days does is to evaluate whether the indicated data variable is within a range of x days, specified in the subsequent field.
One example scenario could be to set an if statement, if that variable is "=" or "contain" the string "Special Event" send an email, otherwise send another email. I also linked the failure of the decision step to send an email.
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Thanks!