The TriTorusRex Space Station can be constructed in less than one year.
SpaceX has the goal of producing 1,000 Starships per year. A dedicated Stationship factory could do the same.
Given that the station needs less than 650 ships, if it started being built in January, it would be finished by September the same year.
Not only is this unheard of up until now, but once the first one is finished, the next one can begin straight away.