I know - when you have a theory, you look for evidence that supports your theory. But this nugget, found on Hunter Walk's Elapsed Time blog, was too good to pass up.  I'll let you draw your own conclusions:

Recent research suggests that we can be motivated by the notion of receiving feedback quickly after performing a task. Two Canadian researchers ran an experiment where students giving a presentation were told in advance when their work would be evaluated - a randomly assigned delay ranging from 0 - 17 days. The results?

"Students who were told they would receive feedback quickly on their performance earned higher grades than students who expected feedback at a later time. Furthermore, when students expected to receive their grades quickly, they predicted that their performance would be worse than students who were to receive feedback later. This pattern suggests that anticipating rapid feedback may improve performance because the threat of disappointment is more prominent."