Time for stuff to go into public domain should be like 3 years.
That's what happens in reality anyways.
The goal of having a copyright law is not to create fairness. It's to ensure there is enough of an incentive that works get created, while still maximizing the public use of it. I'm personally for 10 or 15 years, but even 30 years would be okay compared to the absurdity we got today. This is so clearly only about protecting the profits of those who have enough money and power to influence laws.