Total POC talk time: 5 minutes and 40 seconds
Total run time of all films: 1,207 minutes
That comes out to 0.47% of screen time in which POCs speak throughout the entire series.
This is split among 12 characters and 13 actors (Parvati Patil was played by two actors, Sitara Shah & Shefali Chowdhury)
Of these 12 characters, 2 were CGI bodies voiced by POC actors (Firenze & Shrunken Head)
On average, each POC character speaks for 28.33 seconds.
gif source: http://itsharrypotterbitch.tumblr.com/