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If you mean an expession such as "quarter of six," it means a quarter of an hour before six o'clock, or in other words, 5:45. A quarter of an hour is 15 minutes (1/4 of 60, the number of minutes in an hour). Two quarter-hours make half an hour.
Six
Six minutes.
Just shift the decimal over to the left six times; 1 x 10 to the minus six becomes 0.000001