The second cost is the self-inflicted one. A bad shot takes one stroke, and carrying it to the next tee takes several more, because now you are playing angry at a game that only responds to the swing in front of you. Four hours is long enough for one mistake to eat an entire afternoon if you let it.

Build a short reset between attempts. Breathe out, say one word, pick the next target before you step up. The point is not forgetting the last one, it is making sure it has finished happening before the new one starts.