  By assuming simultaneously the unitarity of the Hawking evaporation and the
universality of Bekenstein entropy bound as well as the validity of cosmic
censorship conjecture, we find that the black hole evaporation rate could
evolve from the usual inverse square law in black hole mass into a constant
evaporation rate near the end of the Hawking evaporation before quantum gravity
could come into play, inferring a slightly longer lifetime for lighter black
holes.
