I'm confused as to why you think it should count as 12 hours (as you haven't stated your circumstances) As I read it, there are two times when you can be excused from counting standby in full - hence b. i and b. ii. Let's disregard b ii for now as its not day time standby.
So b. i. Only applies if your time to report is 3 times more than your minimum reporting time. I am a commercial pilot, but not with airlines. I maintain a 2 hr standby at home, with a minimum report time of 30 mins prior to flight. Therefore, the way I see it (and our FOI agrees) is that we meet the requirements of b i, hence we record half duty time if not called in.
Of course, if in your line of work you are on 2 hrs standby, but minimum report time is 1 hr, then yes I agree, half duty cannot apply.
(if you are a pedant, you could read the 'and' between b) i) and b) ii) in the line a) ii) as meaning you have to adhere to BOTH conditions, but to me that just doesn't make any sense, and why go to the bother of separating the conditions?)
Last edited by Paul Chocks; 17th July 2012 at 18:05.