None. Every country has the same length day. The only time a day is ever 23 hours is when the first day of daylight-saving begins, and then it is brought forward 1 hour, technically making it the only 23-hour day of the year. Then when it returns to normal time at the end of daylight saving there is a 25-hour day to compensate.
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23 hours is not a whole day
no, there is exactly 24 hours a day
There are 23 hours and 57 minutes in a day
(23 weeks) * (7 days/week) * (24 hours/day) = (23 * 7 * 24)[(weeks * days * hours) / (weeks * days)] = 3864 hours
a martian day has 24 hrs,37min and 23 seconds.