I don't understand where the author got the idea that git was production ready in 10 days... Let's look at git history:
- Official development started on 03.04.2005.
- Git could self host on 07.04.2005.
- Git achieved Torvald's performance goals on 29.04.2005.
- On 16.06.2005 git was used to release the Linux kernel for the first time. That can be considered the first beta release, which achieved its goals, but wasn't production ready yet.
- Production ready v1.0 was released on 21.12.2005. That's waaaaaaaay longer than 10 days.
No good software is released in 10 days.