DLP Policies for large datasets

Does anyone have any experience using Office 365 DLP? If so, can you comment on how effective this is at analyzing large sets of data (25 - 50TB) and how quickly this may return results? For instance, if user data is migrated into Onedrive in bulk, how long might we expect it to get through all of the data and be confident that analysis is complete on all the user files?

Thanks!