Exactly three times
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Once with a remainder of twenty four
Four times with seven remainder, or 4.26666...
Provided they are not overlapping, there are 20. (Four angles in a square, four times five equals twenty.)
21,481,816minutes = 14,917days 22hours 16minutes
There are many - two thirds is its simplest form, but there's eight twelfths, sixteen twenty fourths etc. But you can't get simpler than two thirds.