> their engineers are excellent... they work 12 hours plus a day regularly
What? In my experience people who are good at their job can get it done in a reasonable amount of time. Working 12 hours a day is obsession, no competence. There can be overlap, but there is no causation.
At a company like Anthropic, which is one of the fastest-growing companies in the world, there is more work than anyone can reasonably deal with
You can look at the number of github issues on the claude code repo and think about how many hours a day people need to work to address them.
Then look at the changelog of Claude Code. They are releasing daily.