There are 24 hours per day and 365 days per year (not counting leap years which would make only a tiny correction) so we have 24 x 365 = 8760 hours per year. So, 3,000,000/8760 = 342 and a half.
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It is "An" hour, not a hour. The "an" comes before every vowel sound, not every vowel.
The high tides change approximately after every 12 hours depending with the season.
1 million minutes.
A mechanical tach will register 1 engine hour for every 100,000 revolutions. At 1666.6 rpm it will register 1 hour for every hour run. At 800 rpm it will take two hours of run time to register an hour.In my opinion this was a more accurate method of measuring engine wear but is rarely used any more.10 hours on the tach means your piston went up and down 1 million times.