According to [0] that is around 1/400th of total internet traffic per second. This begs the question: who has that kind of botnet at their disposal and why are they targeting Github?
Edit: The attacker didn't need nearly that kind of bandwidth to execute this attack. See [1]
Edit: The attacker didn't need nearly that kind of bandwidth to execute this attack. See [1]
Edit: 1/50th -> 1/400th (bits vs bytes)
[0] http://www.internetlivestats.com/one-second/#traffic-band
[1] https://news.ycombinator.com/item?id=16493497