I can’t recall but I know it was somewhere around when you started messing with oil. Honestly the problem was space for sure. You build this massive complex factory but then you have to start making adjustments to try and fit new parts in and it just got so complex that in order to proceed I was gonna have to gut entire sections and restart, just lost interest.
Still an amazing game and I loved every minute of it. I did the same thing with rimworld. I have dozens of hours and I’ve never once launched the rocket lol.