I think 8pm to 9 pmWhat would be the most efficient time to upload a video to YouTube since I have setup an ad locker and need people to click it.
It really does depend on the video and the timezone. In Europe, you could try posting the video around 9, or 10 am, and after work hours - so 7 or 8 pm. You should avoid early morning and afternoons - 1 to 2 pm.