Which EPL match has had the longest injury time added at the end of 90 minutes?
Longest additional time: 12 minutes 58 seconds (Arsenal v. West Ham United, 23 January 2013)
Here is the match report for the game from the Guardian. The time added on was due to an injury to the West Ham player Potts.
The visitors' bleak evening was compounded when the substitute Danny Potts was carried off wearing a neck brace after almost 10 minutes of treatment, having lost consciousness in a sickening aerial collision with Bacary Sagna. The West Ham manager, Sam Allardyce, reported that Potts had "hit the ground like a dead weight" with the "double blow" being the manner in which he landed on his head.