From an open holster, about 0.75 seconds. From concealed (sport coat as a cover garment), 0.9 seconds. From concealed (untucked buttoned shirt), about 1.5 seconds.
I'm one of the faster guys from the draw at my local IDPA matches. Problem with me is that I'm also one of the worst shots from concealed
I need much more live fire practice; most of the time, I practice my draws and reloads, in my man cave, with an empty gun and magazine.