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6s
from 4 o'clock to 7 o'clock, 3 hours (3hr x 60min x 60sec - 3sec + 6sec)
7 N3 C! w2 q6 x, c% Y' u! ^
$ ^4 {  }: J" w: L0 H= 10803 sec
sorry, 應該係 (3hr x 60min x 60sec + 6) = 10806 sec
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