Well, if you want to take what I said literally, it seems I need to explain..

My point is, he thought about it for some time before he was free to start the work, then he laid down the basics in less than a week, so he was able to start using Git to build Git, polished it for a while and then turned it over.

Here's an interview with the man himself telling the story 10 years later, a very interesting read:

https://www.linuxfoundation.org/blog/blog/10-years-of-git-an...

https://en.wikipedia.org/wiki/Git#History