I wondered this myself, since the singularity is assumed to be a point, thus it should spin as fast as possible. But this appears to be more complicated: http

I wondered this myself, since the singularity is assumed to be a point, thus it should spin as fast as possible. But this appears to be more complicated: https://physics.stackexchange.com/questions/183832/typical-rotation-speeds-for-black-holes https://physics.stackexchange.com/questions/183832/typical-r... https://physics.stackexchange.com/questions/174247/is-there-a-horizontal-event-horizon-on-a-spinning-black-hole https://physics.stackexchange.com/questions/174247/is-there-... Taken from one of the stackexchange posts, this is quite interesting: http://www.nature.com/news/spin-rate-of-black-holes-pinned-down-1.13512 http://www.nature.com/news/spin-rate-of-black-holes-pinned-d...