We had our third kid in late November, and I worked sporadically on it over the following two months of paternity leave and holiday... If I had to bet, I'd say I put in well over 200 hours of work on it, the majority of that being manual auditing/driving of the generation process. If any AI model were reliable at checking the generated pixels, I could have automated this process, but they simply aren't there yet, so I had to do a lot more manual work than I'd anticipated.

All told I probably put in less than 20 hours of actual software engineering work, though, which consisted entirely of writing specs and iterating with various coding agents.