I tried looking for this the other day, and couldnt find exactly what I was looking for so I wrote my own. I'm posting it here in the hopes that if no-one else needs it... well, at least I'll be able to find it again the next time I do
$begin = TimerInit()
Sleep(3000)
$dif = TimerDiff($begin)
$sTime = _TimeReadable($dif)
MsgBox(0, "Elapsed Time", $sTime)
Func _TimeReadable($mili)
$TotalSeconds = Int($mili / 1000); convert miliseconds to seconds
$Hours = Int($TotalSeconds / 3600); 3600 se