>How long someone spends on something is not an indicator of
>how effective they are going to be.
>
>It was in response to the debate of whether Ken working full
>time in promoting Fox versus Robert doing it only part time.

Well it didn't seem a particularly apt one... it assumed that a "Marketing Director" is told what to do and is finished once that (that he has been told to do) is done.
My idea of a "Marketing Director" is to FILL his time marketing a product, including dreaming up new and innovative ways to do so, addressing marketing concerns expressed by his products users, generally taking steps to ensure development of the product, etc. In other words, not enough time, even full time, to fully do the job.

I will agree with your first statement above in the general sense. But I get the distinct impression, in Mr. Green's specific case, that he was pread too thinly, something had to suffer, and we (at least) were it.