How does extending our flight duty period work? It happened to me yesterday. They kept pushing our flight back 15 minutes at a time until we were extended. I told my captain that I didn't want to extend. He pressured me into continuing. He also called crew tracking because I told him I thought we needed to concur. Crew tracking told him signing the release was concurring. I signed the release before I knew we were extending. How is that concurring? My point is it is very hard to turn down an extension. I was honestly too tired to even fight it so I flew the :45 min flight and took the path of least resistance. Actually the captain did. It was his leg. I have been more tired flying under 117 than I ever was under the old rules. You have to pretty much add a half hour to all the published FTD times because the 30 minute post flight does not count.