10 OAuth credentials (client_id/client_secret) per project and per account maximum
The data available for query is limited to the project contractual data retention period
The retention period for the generated files is 7 days. Passed this period, you will not be able to download them anymore. If you missed some files from a daily job for example, keep in mind that you can still create a one-time (“once”) job to retrieve the data a posteriori.
For one-time jobs, you cannot extract data for a date range including more than 7 days.