Due to the fact that Oregon has the shortest preliminary notice deadline in the country, it causes issues on the time necessary to complete the processing of shipment/invoicing and then give enough time to enter the project, allow for research, and file a preliminary notice. I keep seeing that to "be safe" you should use the shipment date, which would be what we use as the invoice date, as the countdown start date. I also saw that weekends and holidays don't count towards the countdown, however, zlien doesn't work them either way so that wouldn't extend the processing time necessary. I know that certain states define "ownership" of materials being shipped transfers at different times. I don't know if that definition plays in with this deadline countdown as well.