My guess is 2 to 3 seconds to create that milky water flow. Water scenes and, in particular, cascades and falls are some of my favorites, to the point of collecting an entire folder of images all along these lines, the intent being a screensaver of similar items. With your kind permission I would love a copy of this on that folder.
If you've ever wanted to make a difference but found it hard to believe that one person could... check out the Kiva Team Caedes discussion thread and discover that anything is possible.