The duration for a dataset analysis depends largely on how many records and duplicates are included in that dataset.  

DataGroomr has a global limit of 3 hours for analysis, if you're getting "Time limit exceeded" error, there are few things you can try to speed it up.

Break up large dataset into smaller ones

A simple way to improve performance is to break up a large dataset into several smaller ones using filters.  To learn more about creating datasets and applying filters see custom datasets.

Increase minimum match confidence

Another quick solution is to increase the minimum match confidence in dataset settings.

Create and train matching model

Recommended solution to significantly reduce analysis duration is to create a matching rule that is trained specifically on your data. You can learn more about it by reviewing the how-to guide or watching the overview video.