I've noticed, while using the ProgressBar class, the elapsed time correctly counting seconds, switching to "1 min" then a second later jumping up to "2 mins". I've narrowed the problem down to the Helper::formatTime method:

return ceil($secs / $format[2]).' '.$format[1];

shouldn't it be using floor?

On a second thought, no it shouldn't. using floor will result in strings like "1 mins".