Season 9 vs season 10 game duration

https://www.leagueofgraphs.com/fr/infographics/patch-9-22-infographics https://www.leagueofgraphs.com/fr/infographics/patch-9-23-infographics

season 9 : https://i.gyazo.com/98dd5ddf5e770e6184114d063426042a.png

season 10 : https://i.gyazo.com/0be583958b84bfe3731c2808c364f40b.png

as you can see, the % of games that last 20 and 25 min has decreased while the % of games that last more than 25 min has increased (30, 35, 40, 45; 50) the % of games that last 10 and 15 min has also decreased

we can see that the number of games that last 20 min has increased by 1% which might mean that more games end in surrender. Other than that, game duration has increased.

season 9 : https://i.gyazo.com/ebf4831e0aa69d0b02922e44d780ae86.png

season 10 : https://i.gyazo.com/adb8cf30fcb18bd9e6b6b7b55b66f46f.png

as we can see, nothing really changed except dragons. The first dragon killed has 1.18% less chance to win. This is actually huge because remember when Riot introduced first blood tower the %win rate of first tower was increased by 2%, the snowballing was so huge that ziggs botlane strategy showed up and Riot had to nerf the gold the first blood tower gave.

I suspect that the nerf to dragons and rift herald decreased snowballing and increased the duration of games in season 10.