Set increment length to 5 seconds, click auto-turns, wait for while (real-world time), click them off and see if you can use a longer increment again.
The problem is that an NPR wants to do something (well, probably several somethings), and that it can only manage one thing per sub-pulse. Worse, in a six-hour time jump the thing might be impossible, or it might change what the NPR wants to do. It's probably stuck in a loop.
The point is to churn through as many short increments as possible in order to let the NPR do the thing it wants to do, and then decide on a new thing.