The Strangest Black Holes in the Universe. Fastest-spinning Black Hole. Black holes can whirl the fabric of space around themselves at extraordinary speeds. One black hole called GRS 1915+105, in the constellation Aquila (The Eagle) about 35,000 light-years from Earth, is spinning more than 950 times per second.
An item placed on the edge of the black hole's event horizon — the edge past which nothing can escape — would spin around it at a speed of more than 333 million mph (536 million kph), or about half the speed of light.https://www.space.com/15941-strangest-black-holes-universe-countdown.html