We forget that back in the olden days parks used to start on their new rides in the fall and have them open by Memorial day. SDC has often started earlier and opened their rides earlier, but the trend of taking two years to build something is somewhat recent. With standard construction schedules, there's no reason they can't build a coaster from the ground up in six months. They've got over 7 months until the park opens for spring 2023 and the building itself is already mostly done, so they just have to get the actual ride setup. I assume most of the fabrication is being done somewhere else rather than having to build the track like they probably did with the original FITH.