If you change your type of credit reporting(B,A) field from blank to either "B" or "A" (blank = exception reporting, "B" = balance reporting, "A" = all) the next time you run the credit reporting process it will run much longer than normal. This is because the program must go back in history and report all accounts that now meets the new criteria. This will only happen with the 1st run after the change.
We recommend you run this 1st process on a weekend so it does not run into your nightly processing.
Keywords - Article Credit Reporting Types