An average chimney sweep service to clean your fireplace takes 1 to 2 hours. However, a level 1 cleaning and visual check on a well-maintained chimney takes less time. Fireplaces with broken dampers or blockages above them will take more time to clean.
If no fireplace cleaning has occurred for more than a year, or you see signs of other damages, then allow more time for a deeper inspection. A level 2 or level 3 cleaning and inspection might be necessary to create a safety report and prepare for renovations.