TheDutchTexan
I Love YTtalk
Less than 5 seconds. You do not want to bore people with the same footage every time if it's longer than 5 seconds. I now work it into the video as kind of a transition between a vlog portion (in case of my cars and coffee stuff) or to signal the start of the car review after showing a teaser of the most exiting part of the car review I filmed. But even before not many people clicked off because of the intro, it is nice and short.