So I've run a successful test in the Dev Console. One of the columns visible on that tab is duration. My result is "0:28". I'm not sure if that is 28 seconds, .28 seconds or 28 milliseconds. Any ideas? BTW, the log shows the test starting at:
and ending at
which appears to be a total duration of just under 23 seconds for everything. That suggests 28 seconds is not the answer, but I'd like to know what the units are for sure.