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Quantum fluctuations of the metric provide a decay mechanism for black holes,through a transition to a white hole geometry. Old perplexing results by Ambrusand H\'aj\'i\v{c}ek and more recent results by Barcel\'o, Carballo-Rubio andGaray, indicate a characteristic time scale of this process that scaleslinearly with the mass of the collapsed object. We compute the characteristictime scales involved in the quantum process using Lorentzian Loop QuantumGravity amplitudes, corroborating these results but reinterpreting andclarifying their physical meaning. We first review and streamline the classicalset up, and distinguish and discuss the different time scales involved. Weconclude that the aforementioned results concern a time scale that is differentfrom the lifetime, the latter being the much longer time related to theprobability of the process to take place. We recover the exponential scaling ofthe lifetime in the mass, a result expected from na\"ive semiclassicalarguments for the probability of a tunneling phenomenon to occur.

Characteristic Time Scales for the Geometry Transition of a Black Hole to a White Hole from Spinfoams