How fast you lose viewers while waiting for the video to load

“What we found was that people are pretty patient for up to two seconds,” Sitaraman says. “If you start out with, say, 100 users — if the video hasnt started in five seconds, about one-quarter of those viewers are gone, and if the video doesnt start in 10 seconds, almost half of those viewers are gone.”

via In Video-Streaming Rat Race, Fast Is Never Fast Enough : NPR.