So you need to have at least 10 time steps in one period to capture a free vibration. Ideally 20 steps per period.
So say the free vibration of interest is 10Hz, or T_period=0.1 s, then the time step in the analysis settings should be T/10 = 0.01 s at least or even better T/20 = 0.005 s (at least for the 2nd step when the free vibration occurs).
See here for more info (3 min.30 s mark – 6 minute mark in the below – time step discussion):
All the best
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