I'm very happy with having solved this kata. This was the first time I've implemented depth first search.
I really feel like I'm applying the ideas of graph traversal. Also I think this is my first 2 kyu kata.

Think about it a little broader... The listed times were an hour and 15 minutes and 59 seconds, 1 hour 47 minutes and16 seconds, etc... These represent a definite time value. One length of time. If you want to do statistics on these times, it isn't going to work to break them into partial times.