How long do we wait to say an experiment is working or failing? The sign says it all Hana Hou Restaurant is famous for being the Southernmost restaurant in America Ordered the Macadamia Nut Chicken How long do we wait to say an experiment is working or failing? After five days, having dinner no later than 2pm Hawaii time (8pm EST) is working. No food other than fruit or ice cream after 2pm. Next Blog By jeff noel Retired Disney Institute Keynote Speaker and Prolific Blogger. Five daily, differently-themed personal blogs (about life's 5 big choices) on five interconnected sites. View all of jeff noel's posts.