Hello all, To my knowledge, there are still a lot of questions regarding the specifics of black hole formation. My question is in regards to formation time. I've read that the actual formation takes "less than a second" according to the equations. Does anyone know where time shows up in the black hole formation equations or where this statement derives from? I'm not familiar with the specifics of the black hole formation sequence but if anyone has any resources I'd be grateful for them. Many thanks!