Assuming that you means a second, rather than a sencond, the modern definition is that it is the time it takes for 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.
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There are 1,000,000 microseconds in a second. So, 1 second is equal to 1,000,000 microseconds.
1 second = 0.000277777 hours
1000
1000 milliseconds = 1 second
1^2 = 1X1 = 1 ft