My permit requires me to test once every twelve months. What is the window for testing in the next year?
Generally this means that you should test at any time in the same month the following year. So if you tested in September 2004 the next test should be conducted in September 2005. If instead you conduct the second test in July 2005, the next subsequent test would be due in July 2006 as annual tests cannot be more than 12 months apart.
