alt Hacker NewsAmazon had valuation of $60M at their first venture round, and it took them 19 years to 3500x it to $200B.
Anthropic had valuation of $550M at their first venture round, and assuming it IPOs at roughly $2T, it will take them 5 years to give this 3500x return to their initial investors.
Companies IPO much later now because the laws changed. They used to be forced to IPO much earlier because employees shareholders pushed them over the threshold for # or private shareholders.
So you're absolutely correct about the comparison.
That said, I bet whatever happens over the next 20 years goes beyond what any of us can imagine. I wouldn't be surprised if the winners of this paradigm are worth hundreds of trillions. Sounds ridiculous until you look backwards and valuation a and consider this is an exponential curve and time is compressing.