How long did it take to figure out smelting? The crucible? Tongs & gloves? Oh, you're using gloves? Well then you have animal husbandry & textile work involved; how did they figure those out?
@Impious_Jade you might be interested in a book called Cræft
An Inquiry into the Origins and True Meaning of Traditional Crafts by Alexander Langlands.
while it's heavily based on England/European history, it still might be of interest if you like the why of things
@redenigma Oh cool, I'll have to check it out! Thanks :)
& so on.
Technologies build on other technologies, they don't stand alone.
Anyway, here's the Wikipedia article on the Antikythera Mechanism, for an introductory overview: https://en.wikipedia.org/wiki/Antikythera_mechanism