It can take anywhere from two to four weeks. It depends on the complications, implications, and overlap with other sentences. Some changes are relatively straightforward, and it just takes pure extrapolation to determine what the number would be. For others, though, we have to go back and say, okay, if that happens there, we're going to have to discount something else that might have occurred, and work it through. That's usually when it takes more than a couple of weeks to do.
On May 29th, 2006. See this statement in context.