Struggling to keep Focus in AFC

[sk66]

I just use the image review on the back of my cameras with focus point highlight turned on.

Keep in mind that the longer you have the focus delay set for the longer it will wait to leave the selected point when focus is lost. If you have it set to the longest setting it may never move (if the AF is active for less than the delay time).

In the longest setting of 5 in A3, the delay is of 2 seconds and not forever

I probably stated that "poorly;" there is no delay for it "leaving" the selected point regardless of the setting... I should have said "return to the selected point when focus is lost." If focus isn't lost it's not going to "start over."

Camera dependent maybe...I just checked my D800 and it seems to be ~ 1 sec. when set to 5. But for a lot of what I shoot 1sec is forever...

And this function is fairly poorly "titled." It's really a "refocus delay" for when focus is lost. It's also active if you only have a single focus point enabled (i.e. non-dynamic mode) with AF-C.