Getting and Viewing Your CloudTrail Log Files
After you've set up CloudTrail to capture the log files you want, you'll need to be able to find the log files and interpret the information they contain.
CloudTrail delivers your log files to an Amazon S3 bucket that you specify when you create the trail. Typically, log files appear in your bucket within 15 minutes of the recorded AWS API call or other AWS event. Log files are generally published every five minutes.