Seeing Katyusha on top of the tank in one of the pictures sure gave a moment of pause 😁

3D printing times are highly suspect to factors such as Layer Height, Print Speed, Acceleration, and SquareCornerVelocity ( aka Jerk ) with the former two also needing a proper foundation of a Nozzle/Heater Combo capable of supporting the Volumetric Flow required to not ending up being the bottleneck. Things my Mendel Style Prusa i3 MK3S would have printed in 2h my CoreXY Voron 2.4 now does in between 30-40min - If you want to go fast then CoreXY 3D Printers is the way to go and ideally also an enclosed one ( like the entire DIY Voron Lineup ) allowing the use of materials like ASA ( a less P.i.t.A. form of ABS super prone to warping and other issues ) which is generally more practical for both the speeds and later on also the postprocessing than materials like PLA, PETG, etc... would be.