The actual time in the air would be 5.9 hours (probably longer, since spec sheet range numbers usually are at economy settings, but speed is quoted at 75%). Two fuel stops, however, are going to add 1.5 hours (45 minutes per stop, which is conservative) for a total of 7.3 hours.
A normal lens or normal prime is a lens with a focal length about equal to the diagonal size of the film or sensor format, or that reproduces perspective that generally looks natural to a human observer under normal viewing conditions.
Things to consider when buying one include the focal length, the aperture range, the cost, and the fit for your camera (i.e. a full frame or a crop sensor). As with other types of lenses, they are available as either prime (fixed focal length) or a zoom lens, and there are variances in quality between the two.