Hashing hardware capability is typically measured in trillions per second (TH/s) so the math might be better using trillion instead of billion. As I understand it, the rental cost of 1 PH/s (which I think is one-thousand-trillion?) is about $10/hour. From that I think you could work out an actual cost to generate a collision!

Even taking the smaller value of 463439129036942 billion years at 1 billion/second (and therefore 463439129036942000 years at a quadrillion/second), at $10 / hour / PH/s, that’s $4.06e22, or ≈ 480 million years of Earth’s 2020 global nominal GDP.