Mar 14, 2017 · 8. Suppose that the length of time between consecutive high tides is approximately 12.5 hours. According to NOAA, on Saturday, August 7, 2014, in Juneau Alaska, high tide occurred at 8:11 AM (8.1833 hours) and low tide occurred at 2:14 PM (14.2333 hours). The height of the water at high tide was 13.2 feet, and the height of