  Fast Radio Bursts (FRBs) are energetic phenomena that have significant
implications for understanding fundamental physics and the universe. Recent
observations of FRB 121102, FRB 20220912A, and FRB 20201124A by the
Five-hundred-meter Aperture Spherical Telescope (FAST) showed high burst rates
and distinctive energy distribution and temporal properties. In this study, we
examine these observations to investigate the scale invariance of the waiting
times between bursts for intervals longer than approximately 1 second. Our
analysis revealed a unified scaling law for these longer intervals, which is
similar to the behavior of solar flares. This discovery inspires us to suggest
a dual analogy of the FRB scenario across the entire time intervals: with
earthquake dynamics at subsecond scales and with solar flare dynamics beyond
the one-second threshold. This threshold potentially aligns with the dynamic
time scale of neutron star crusts, offering insight of the occurrence of FRBs
into the internal processes of neutron stars.
