Thought for a Monday: Shorter is better.

"The mind concerns itself only with thoughts, imaginations, reasoned arguments; it declines to assimilate the facts unless in combination with its proper pabulum; it, being active, is wearied in the passive attitude of a listener, it is as much bored in the case of a child by the discursive twaddle of the talking teacher as in that of a grown-up by conversational twaddle; it has a natural preference for literary form; given a more or less literary presentation, the curiosity of the mind is enormous and embraces a vast variety of subjects." ~~ Charlotte Mason, Towards a Philosophy of Education

Need I say more?

But you might want to check out The Science Behind TED's 18-Minute Rule.