Hi jdsa! I believe Conor reached out to you directly, but I wanted to provide a response here as well in case other users have the same question.
Point outside of reasonable time frame refers to any data value with a time stamp that is more than 1 year in the past. We typically don't see users sending in points that are more than 1 year in the past, so this functionality was put into place so that they would be aware if their time stamp was incorrect. We'll review this with engineering to determine if this something we should consider increasing in the future.
Thank you very much for the great question!