The time that I gave is based on an average day in August (overcrowded), assuming to go there in a very "touristic" approach (with persons that are not familiar with the mountain) without being worried for the time spent in queue.
I have seen too many stupid accidents happening there! Unexperienced people moving rocks, persons try to pass slower walkers, persons behaving as "Superman" and shouting, people in beach sandals, kids running without looking......
So I prefered to give a "quiet" estimate, implicitely suggesting some caution.