Optimal Timing for Superintelligence: Mundane Considerations for Existing People
[Sorry about the lengthiness of this post. I recommend not fixating too much on all the specific numbers and the formal apparatus. Originally the plan was to also analyze optimal timing from an impersonal (xrisk-minimization) perspective; but to prevent the text from ballooning even more, that topic was set aside...
(I added a few remarks on this in my reply to quetzal_rainbow, although - sorry - nothing numerical.)