I often run Laddie on time-up drills even on days when we do no other training.
For example, yesterday I did some exploring and found a huge, deserted grass field we've never trained on before. I took Laddie out and ran him on three ~200y blinds. The field offered little in the way of factors, and I used some extra whistle sits just for practice.
The main point of the drill was that I was prepared to use a Walk Out if Laddie had any slow sits. But he didn't.