Kristen Is Calm
I don't caaaaaaare!
I prefers my videos short. If it's really funny, I like long videos but the reason I go on to Youtube is for those short videos. About 1-3 minutes. So I guess, short & straight to the point. 
Although it does depend on the type of video you're making so keep that in mind.

Although it does depend on the type of video you're making so keep that in mind.