Ideas about how to increase the duration of games (if riot wishes to)
disclaimer: those are general ideas, not every single one of them has to be introduced, this is just general thoughts about how can one increase the duration of games
Towers: every tower gains +15% damage reduction per champion around 1000 units of towers until 20 minutes red buff no longer procs on towers First blood tower bonus gold increased from 350 to 450 (to avoid 1 hour games)
Ambient Gold: FOR DOING NOTHING, you get ---> 10.2 gold per 5 seconds 9 gold per 5 seconds
minions: no longer deals any bonus damage depending on champions levels