[Anderkent]

It's fairly clear in the context that he's using O(x) in the informal 'order of' meaning: 'order of 10', 'order of 1000' etc.

[mreid]

I agree, and had no problem understanding his intended meaning but I was irked by the unnecessary misuse of technical notation to attempt to get across an idea that would have been perfectly easy to write without it (e.g., "10 times" and "1000 times").