We haven’t been able to find any studies that specifically looked at the best time to livestream on YouTube. That said, logic says that 4 to 6 PM would be the best time to livestream. This is because 2 to 4 PM is the best time to post regular videos, but we can add two hours to that as, with livestreams, you don’t need to account for the time it takes YouTube to index your videos properly (2-3 hours). As soon as you go live, people can start watching.