Time period of a seconds pendulum is 99.3955111cm at a place where the gravitational acceleration is 9.8m/s2
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5.94 m
2.01 seconds.
The period of a simple pendulum of length 20cm took 120 seconds to complete 40 oscillation is 0.9.
It doesn't matter what unit you use to measure the physical length of the pendulum. As a matter of fact, it doesn't matter what unit you use to measure the duration of its period either. If both are at rest on the same planet, then the penduum with the longer string has the longer period. Period!
The period of a pendulum (in seconds) is 2(pi)√(L/g), where L is the length and g is the acceleration due to gravity. As acceleration due to gravity increases, the period decreases, so the smaller the acceleration due to gravity, the longer the period of the pendulum.