https://www.usconcealedcarry.com/blog/one-shot-two-sight-pictures/
It really depends on the range and conditions. Typically I can turn in splits around .21-.35 between 3 and 21 feet with very acceptable accuracy on the range and a bit faster running high on adrenaline still maintaining decent defensive accuracy but I’m not going to win any kind of competitive match shooting 4-6" plates because I’d have to slow down to maintain that kind of accuracy.
I’d say the more important thing for most people to focus on is learning to cover/conceal their draw and get to a sub 1.5 second draw to accurate first shot.
Generally in a fight it’s the person that puts the first disabling hit on their opponent that wins the fight.