Reading graphs from SOAP UI Load Tests

Hi,

I am a newbie and I have a similar problem posted last month in SOAP UI forum, this is the link. viewtopic.php?f=2&t=7810

But as Ole suggested the bottom axis doesn't seem to represent the time I ran the test. I ran my tests for mere 10 seconds but my axis shows upto 40 (seconds?). I am not sure what measure is it? Appreciate your help on this.

Thanks!