Not the OP but I just got done with a codebase-wide re-architecture (driven by a need for a complex data migration) in a little ~2.5 weeks. 800+ files changed,

Not the OP but I just got done with a codebase-wide re-architecture (driven by a need for a complex data migration) in a little ~2.5 weeks. 800+ files changed, 60k+ line diff. Without AI it would have taken me several months, and that is only if I managed to avoid burnout. The vendor quotes we got just to see if we could outsource the work were all six figures.