Better is better. Period.
Often, our tendency when we compose a speech, sales pitch, TV interview, or any kind of performance, is to feel that two hours of stage time is better than one, and ten minutes is better than five.
Better to plan your delivery based on greatest impact. Better to leave them wanting more rather than with too much.
“It is vain to do with more what can be done with less.”
– William of Occam (1300-1350)