An etl job could take an infinite amount of time. I am not trying to be cute by saying this but the point is that some ETL jobs might be as simple as loading da

An etl job could take an infinite amount of time. I am not trying to be cute by saying this but the point is that some ETL jobs might be as simple as loading data from a file others could involve millions of transformations. There is no limit to what you can do in ETL. This is not just loading the data from a file and providing it to xgboost.