[dwolfson]

I can't answer this first hand, but my impression is that not necessarily the entirety of those 14 hours on Wall Street is usually spent doing work that requires "creative thought, ability to associate concepts from different domains, thinking about problems from different angles." One reason for the long hours is that most of the difficult work piles on later in the day due to bottlenecks, or waiting for feedback/turnaround. Another is the unspoken rule on "face time."