For paid users, keyword tracking is updated every day. 

For free users, it takes up to a week.

The count starts when the project is created and new keywords are added.

If the keywords or the locations are too specific, the tool may take time to return data. 

Also, the amount of traffic your site generates impacts on how long it will take to gather the data. 

New websites and websites that have low traffic tend to take more time to return positions.