How does "cost" per frontier task change with time?

Extrapolating any exponential growth is always dangerous, but over say 3 years at this pace, we'd go from 2 hours to 70,or about 8 days' work.

Quite scary. But what does cost do over the same timeline? Does it increase with computational complexity? Is it worse - because, IIRC, transformers computational cost is quadratic in context length. Is it better - some kind of economies of scale?

I glanced thought the article but couldn't find any info on this.