Long or short doesn't matter in the least. The important factor is clarity. State your arguments, as clearly as possible, then support them with something substantial. Above all, don't berate your audience for the failures in your presentation.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'
