I like this story very much. To me, it shows that time shouldn't be a factor if you really want to reach a goal. There are no short-cuts, and often the short-cut in the long-cut. Especially with the practice of Dharma, the longest, hardest way is the most beneficial to you. By asking for quicker progress, he is showing that his mind is not ready for it as well, as being impatient about something actually means in some aspects that you don't truly want it. If you did, you would be prepared to wait for as long a time, and work as hard as needed to achieve it.