It appears that if I want to "manually select a winner" of the A/B split testing, the results are sent immediately?
At least that's the way I read the button that says, "send version A now". My goal is to maintain the same 23 hour schedule but select the winner before I go to bed and not have to get up in the middle of the night and possibly make a mistake because I was sleepy.
Or else be able to change the winning parameters from opens to clicks after starting the test. But that doesn't appear to be possible.