The Speaker of the House, Chair, has also, in practice, limited the length of time for questions of privilege raised in the chamber. Having done that, the scope for members offering their points has to be very tight. The Speaker, the Deputy Speaker and the Assistant Deputy Speaker have sat members down when they've turned it into a soapbox.
Evidence of meeting #120 for Access to Information, Privacy and Ethics in the 44th Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was chair.
A recording is available from Parliament.