Within GR theory, without going to the extreme r/0 as a radius, (but approaching that as an asymptotic case), is there any theoretical limit as to how small the event horizon of a rotating and/or charged black hole can be?
I appreciate that the Hawking radiation hypothesis postulates that micro black holes, especially primordial ones, should be hard to find, due to evaporation although, as far as I know, this is still a speculative idea, with unfortunately no definitive data to confirm or falsify it.
I am also aware of the possible basis of Planck lenght effects, but again, as far as I know, these are speculative ideas, without observational proof.
To sum up, I want to ask this question regarding GR within the observational effects we have already confirmed.
EDIT apart from CuriousOne's comment, which is true of course, I need 1 assumption for this particular question! END EDIT