No, the default value is 5 seconds and it has effect if no `stat_interval` is defined in sys.config. The default value is defined [in the epcap herader file](https://github.com/esl/epcap/pull/5/files#diff-f75546e03f7da2bc4eb48fb9f37a60a8R65). Anyway you revealed the ambiguity. I'm going to improve the text accordingly.