DQ was Disney. Disney created 'Disney Regional Entertainment' (DRE) in '96 to come up with these kinds of concepts and DQ was their big splash/flop.
DQ was launched in Orlando in 1998, and was scheduled to open site #2 in Chicago.. with philly next. Chicago opened in 1999.
There was no 'very long time' in any of DQ's timescales. Chicago opened in 1999, and they announced they were closing it in July 2001 - and they closed it in Sept 2001. It didn't even last three years before Disney punted on the whole concept.
Many people have written about why the DQ formula failed.. but in the end it probably was just too expensive to operate for its own good. Orlando bundles admissions into the MYW tickets which helps boost things.
DRE was also behind ESPNZone... which has also failed as a national project. I believe
@WDW1974 has mentioned before some exec names that have been involved with DRE that still have a stink associated with them not many realize.