While not as large, we have a pretty good timeframe to go off of for an unpopular show being closed; Rivers of Light. (personally, it was my favorite but I know the sentiment was not largely shared)
Opened in 2017 & closed in March 2020. (pandemic could have sped up the process who knows)
So even if it's not popular, ~3 years minimum would be the length of the show's run.
Far more likely however would be the show being redone with new digital scenes from different movies or maybe even *dramatic pause*
an original story and score!
- we can only hope