Ok I don’t have the idea everyone knows this trick.I’m dutch so hope I explain well lol.
If you only have 1 oven put youre oven back in stock...get it back on and put receipy back on.
Put it back in stock(dont finish receipy)
You will see you get many parts.
If you have 2 ovens change receipy constantly from 5 to 7 hours(dont finish receipy just change receipy’s)
Once you have more ovens you start working on the goal
I hope this all makes sense lol
Have fun!