Embodiments can provide a computer implemented method in a data processing system comprising a processor and a memory comprising instructions, which are executed by the processor to cause the processor to implement a system for providing classification job estimation for a data security platform comprising one or more data sources, the method comprising: for each of the one or more data sources: counting the number of databases; counting the number of tables in each database; selecting a random database; selecting a random table within the random database; retrieving a database data sample from the random table; measuring one or more latencies associated with issuing and retrieving the database data sample; measuring a processing time required to evaluate the database data sample against one or more policy rules; compiling one or more mean times for the latencies and processing times; and calculating a data source scan time using the one or more mean times and the number of tables in each database; and calculating a total estimation time through summation of each of the one or more data source scan times compiled for each of the one or more data sources.