1, smooth (standard definition) image quality: an hour needs about 300M of traffic.
2, high-definition image quality: an hour needs about 500M of traffic.
3, ultra-high-definition image quality: an hour probably needs 1G traffic.
And 1GB= 1024MB, according to data conversion, 1G traffic can watch smooth version (standard definition) video for about 3 hours, HD video for 2 hours, and ultra HD video for about 1 hour.