I was trying to calculate the most likely speed of a Tsunami. This was my first attempt.

 

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At a constant speed of 1,000 miles per hour, a tsunami would take about 2.5 hours to travel the roughly 2,470 miles from Hawaii to California.

Travel Time Details

Distance: The distance from Honolulu, Hawaii, to San Francisco, California, is about 2,470 miles (3,975 kilometers).
Calculation: Dividing the distance (2,470 miles) by the speed (1,000 mph) equals 2.47 hours.

Real-World Physics Context

Actual Speed: Real tsunamis do not travel at 1,000 miles per hour. In the deep open ocean, a tsunami typically moves at 500 to 600 miles per hour (roughly the speed of a jet airliner), limited by ocean depth. 
Actual Travel Time: At a realistic deep-water speed of about 500 mph, a wave traveling from Hawaii to California actually takes roughly 4.5 to 5 hours to make the crossing.
Slowing Down: As the wave approaches the shallower coastal waters of California, it slows down significantly to about 20 to 30 miles per hour, while its height increases. You can check official safety rules during an alert through the National Tsunami Warning Center. 
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The closest region in Mexico to Hawaii is the state of Baja California (including Baja California Sur), sitting roughly 2,710 miles (4,360 km) away from the islands. [1] 

 

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