Amazon S3 in node watch frequency

Hi I'm using the "amazon S3 in" node (from node-red-node-aws module) to watch file events in my S3 bucket. As a start, I passed the output of the "amazon S3 in" node into a debug node. In general this works.
At first I thought it does not work. But then I realized it takes about 15 mins to get the event about an added image file. How can I speed this up and get nearly instant notice?