So slight predictor out there: MMXX's height waiver was filed in 2017, 2019 ground breaking, 2020 opening.
Follow the pattern here: 2019 height waiver, 2021 ground breaking, 2022 opening.
So 2 years between coasters, after 3 years from InvadR to MMXX. More closely related to the Hersheypark cycle of coaster building.