It can be an MEL item on some aircraft (see) [Operation of Wide Body Jets with Door/Slide Inoperative][1].  

If it's not an item that can be deferred per the MEL for a particular aircraft it's likely going to take more than an hour to repack/replace the slide even if the aircraft is at a company maintenance base airport with the necessary maintenance personnel and equipment.  If the aircraft is at a non-maintenance base it would be hard to image resolving the issue in an hour. 

Can you provide a source for the report you are referring to?


  [1]: https://fsims.faa.gov/wdocs/policy%20letters/pl-001_r03_d00.htm