Why torture them? Just kill them so they don't interfere, and do it quickly.
So, let's assume that your average rate is 1 person per minute. In an hour, you'll get 60 "kills." In a day - 1440. At this rate, in a year, you can reach a value of 525,600. This is only 0.00876% of the total number of people. Well, even if you do this until the end of your life (let's say you have 70 years left!), you will only reach 36,792,000. If Neira, Ghost, and Ulric join you, you will multiply your result by 4: 147,168,000. And this is still taking into account that you will be like the protagonist from GTA, walking around the city and committing your dark deeds without punishment.
Your task is impossible, accept it.
Added 1 minute ago
By the way, I forgot to take into account that in 70 years, the Earth's population will increase by a couple of billion, while you will barely reach a hundred million. No, guys, you have no chance.
Bow down and hear our cry,
Our earthly rulers falter,
Our people drift and die,
The walls of gold entomb us,
The swords of scorn divide,
Take not thy thunder from us,
Take away our pride.
G.K. Chesterton: English Hymnal