Interview review boards meet on Wednesdays, and calls go out on Wed., Thurs., and if necessary, Fridays. I don't know if this is absolute, but everyone I know that has NOT been called by the Friday following their interview has been turned down. The rejection emails seem to take 2-3 weeks to go out. I don't know if they hold onto some names until the following week to reconsider them, or if they just do the emails in batches.