Honestly I don't see the big deal in time taken. If actual smiths can make something decently functional on a reality tv show it really shouldn't be such a slog to make one sword as opposed to I dunno whatever an actual order for supplying a  worth of arms would take arm a squad of soldiers. Also only reason japanese swords take so long to make is because of half religious mumbo jumbo rituals and because their metal are garbage.

Plus there's the really important fact that the GM is handwaving the intricacies away of smithing so none of this really matters at all. 

Also I have no idea why it matters to KoL so much given he made a character that was specifically removed from the main aspect of the game. It feels like he's trying to backseat GM which is honestly pretty uncouth.