Looks like if you have 3 points you can deal about 100 DMG to nexus every 4:50min.
So unless the game is a complete stomp its going to go longer then Riot says 10-20mins.
Isn't the first time Riot.
Edit : Also 39IP for a 25Min win lol gg
Practice games give a lot less IP, and when we demo the game for press or fans, it's always practice games. Also, close games are going to give a lot more points to losers than you would see in summoner's rift.
We seldom see games over 25 minutes internally. We often see 20 minute games, 15 minute games, etc. The TotalBiscuit game was a score of 20 to 0, which is out of a possible 500 on each side -- it's about as close as it gets, and it had a lot of situations where because people were new, points were left neutralized but not captured. So, it's about as long as it goes.