This sometimes depends on the terrain and the rabbit population, taking 30+ rabbits in certain areas on the lamp does not take an exceptional dog.
A few years ago in the borders of Scotland the rabbit population was teeming, less than 30 rabbits on the lamp was considered poor, purely down to the volume of rabbits, some as green as grass squatted so the percentage of large runs was reduced, many never bolted for cover when the lamp was shone over them, over time they did become lamp shy and make it more difficult.
Three of us used to go up and ferret and mooch 40-50 through the day, go