Yes, it involved seven weeks of work using Claude Code sessions—from July 25 to September 14, as indicated by the repository commits.

The total cost was simply the recurring monthly subscription fee. I wasn't granted any extra credits by CC; although I occasionally hit my weekly usage limit—partly due to consumption from other projects—I would simply wait a few hours before resuming work.

I spent six to eight hours a day interacting with the session, and whenever I had the time, I dedicated even more hours to it, as my goal was to get the job done. During the final days, much of the time was spent waiting for regression tests to pass so I could proceed with debugging.

The service remained active throughout the entire seven-week period. I consistently used Opus 4.8 to maintain model consistency during development.