Ape Apps

How long did you have to do that?
I've been selling starships 5000 at a time and I only get about 4 bil.

I've been playing on my earth base colony for a while and I have reached the point where I only have one thing left in the tech tree to unlock, which is Advanced Simulation Theory, and I was wondering for all the other people who got this far, how did you get the required 2 trillion dollars? (I know there is an option to pay irl to unlock it, so please don't tell me to do that).

Thanks