If you are referring to the number of years a teacher can work before they retire then the answer is determined by the number of years a person chooses to work. However, there are a variety of...
52*5 = 260 workdays
Minus 8 Bank Holidays = 252
Plus one day (since the year is 52 weeks and one day long) = 253
Plus one day in a leap year = 253.25 on average
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