We delivered our last materials to a large North Carolina private project on 09/08/2020 and billed the Balance to Contract on 09/22/2020. I know I have 120 days (until 01/06/21) to file a lien if not paid for the open invoices. But we also have had a large amount of retention withheld throughout the project. What are the timelines and guidelines for collecting that? I appreciate your help.