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We make a critical comparison between ultra-high energy particle collisionsaround an extremal Kerr black hole and that around an over-spinning Kerrsingularity, mainly focusing on the issue of the timescale of collisions. Weshow that the time required for two massive particles with the proton mass ortwo massless particles of GeV energies to collide around the Kerr black holewith Planck energy is several orders of magnitude longer than the age of theUniverse for astro-physically relevant masses of black holes, whereas timerequired in the over-spinning case is of the order of ten million years whichis much shorter than the age of the Universe. Thus from the point of view ofobservation of Planck scale collisions, the over-spinning Kerr geometry,subject to their occurrence, has distinct advantage over their black holecounterparts.

Timescale for trans-Planckian collisions in Kerr spacetime