I think that ideally, three weeks on, one week off works the best. When you get into the fourth or fifth week, often they are not productive at all: people are at each other, and nothing is moving forward. They are almost like a wasted week, I find, when you get into these fifth weeks, and it takes a toll on the morale of the MPs to be away from their families and in this sort of combative environment for that long a time. It's always good to have a break, to regroup, and then come back. The three-week sitting blocks are ideal.
On May 5th, 2016. See this statement in context.