Gehinnom Isn't Just 12 Months

This, in fact, the Ramban writes nearly 800 years ago, someone that says that Gan Eden is a maximum of 12 months only is turning God into an evil God and is considered a heretic. So, to say that someone that stole one gets the same punishment as someone that stole 100, someone that killed one gets the same punishment as someone that killed 100 is not only stupid, but it's evil. They're turning God into an evil God. So, someone like Manes that teaches that stupidity, obviously, he is a not only a heretic, but he's an Amalekite.