so if they say extend if not leaving within 90 days maybe they actually mean you must do the 90 day report as extension, they are not saying you must leave to extend are they. I think you will be stamped for 1 year. I just looked at my old OA and I was
I don't think you actually have to leave after 90 days but you must do a 90 day report to immigration every 90 days. Someone may confirm this. I am on OX but never stay the 90 days so never had to do a report.