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Gravitational wave (GW) ringdown waveforms may contain "echoes" that encodenew physics in the strong gravity regime. It is commonly assumed that the newphysics gives rise to the GW echoes whose intervals are constant. We point outthat this assumption is not always applicable. In particular, if thepost-merger object is initially a wormhole, which slowly pinches off andeventually collapses into a black hole, the late-time ringdown waveform exhibita series of echoes whose intervals are increasing with time. We also assess howthis affects the ability of Advanced LIGO/Virgo to detect these new signals.

Are gravitational wave ringdown echoes always equal-interval ?