Mr. Brian Purcell:

There are approximately 4,400 people in custody this week. The easiest way to calculate prisoner nights is to multiply that figure or the average figure by 365. There used to be approximately 700 assaults per year, or two per day. This can be seen in the context of there being 1.4 million prisoner days.

It puts it in context if one considers it in the context of the figure, 1.4 million prisoner days. If there are 4,400 prisoners, considering the prison population and the reasons people are in prison-----