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4. Yes, a 9:30 is not "spectacularly fast", but I think that many would be shocked at the work, the time and the durability required to move from 10:00 to that point.I'll echo this almost 100%.
For me personally, I would say the journey from 12:05 to sub-10 was approximately 20% fitness gain, and 80% experience over 27 month or so period.
The journey from sub-10 to where I am now is pretty much reversed - and has taken another 6 years.