Clarification of duration of flashing or flickering (Success Criteria 2.3.1)

Is the duration of the flashing or flickering (i.e., more than one second 
of time) a factor in determining accessibility compliance to WCAG 2.0 
 See Success Criteria 2.3.1 http://www.w3.org/TR/WCAG20/#seizure
 "... do not contain anything that flashes more than three times in 
any one second period..."
In my special case example, there is a slightly less than 1 second 
duration of 3 flashes in an Adobe Flash image at the top of a draft 
Shanghai EXPO 2010 page. 
WARNING - currently it flashes 3 times for slightly less than one second, 
then repeats several seconds later.
 see http://fr.expo2010.cn/indextest.htm
Assuming the developer adds a capability to stop the repeating Adobe Flash 
movie, is it still a problem because it flashes 3 times, regardless of the 
duration (e.g., 1 second, 10 seconds, etc.)? Or does it need to flash 
more that 3 times a second of time for more that 1 second of duration?
The "Understanding Guidelines 2.3" further mentions: "likely to cause 
seizure when viewed even for a second or two."
 see http://www.w3.org/TR/UNDERSTANDING-WCAG20/seizure.html
metrics to consider: Frequency, Duration, and Size (the text only really 
address frequency and size, not duration)
 frequency: (or interval) more than 3 flashes per second of 
time? (3 to 50 Hz) 
 duration: more than one second duration of time? if it 
flashes more than 3, but for less than 1 second, is it a problem?
 size: 341 x 256 pixel block or larger - see 
http://www.w3.org/TR/WCAG20/#general-thresholddef
Since my example only flashes 3 times and not more than 3, and it soon may 
change to not repeat - Guidelines 2.3 says "more than three", then I think 
I do not have a problem, but I'm not sure - hence the question to the 
list. Your informed opinions welcomed.
I also believe the text and explanation can be simplified. For example:
1. by addressing the three different metrics; frequency, duration, and 
size. 
2. by addressing the lower and upper limits of each. For example, if the 
frequency is 40 times in a second, but only lasts 1 second or less, 
regardless of size it may be hardly noticeable and not be a problem. 
3. add some more common passing and failing examples. The two existing 
ones are good. 
Regards,
Phill Jenkins,