Inhib / Nexus Turrets regenerate ONE hp per second.
Lets do the math here.
1 HP / Second = 60 HP / Minute = 600 HP / 10 Minutes = 6000 HP For 100 Minutes = 3000 HP For 50 minutes.
Inhib turrets have 3500 hp, so that means if they get reduced to say, 500 HP by a push, they could literally not regenerate their entire health in the length of a game.
Assuming an auto attack from a champion at this stage in the game does 180 damage a hit, it would take THREE MINUTES for a tower to regenerate just ONE auto attack worth of damage, which a champion can execute in ONE SECOND.
I remember in season 4/5 when inhib / nexus turrets were full health if you didn't damage them for 5 minutes. What the actual fuck happened?