Yes, the grammar is fine, but the content is odd. A deadline is the deadline, not 3 days before!
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Anonymous"Submit the report at LEAST 3 days before the deadline."Whenever this type of notice is posted or mailed to you, a "deadline" is a fixed day. It's the responsibility of the reciepients to make certain that "date" is followed. It won't have such instruction as "at least 3 days". Sometimes, langauge like, "post marked