Thanks for your concern Zeitgeist. I would have to agree with Tripadvisor in saying that it's spectacular any time of day, but if you have only 4 hours to spend there, I would say try to get a little bit of sunset along with evening. I leave out seeing it in the daytime because, while it is still impressive, something about the contrasting colors makes it stand out as the sun sets and it gets darker. Hope I helped!