25m
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If the length of the second pendulum of the earth is about 1 meter, the length of the second pendulum should be between 0.3 and 0.5 meters.
1.0002m
The longer the length of the pendulum, the longer the time taken for the pendulum to complete 1 oscillation.
A shorter pendulum will make more swings per second. Or per minute. Or whatever.
The frequency of a pendulum varies with the square of the length.