I'm not sure that that gets to the point. There is no requirement to specify a specific time period. The only requirement is that the time period applied is reasonable. Without examples of unreasonable time periods being applied, there is no issue to discuss in this regard. Opponents of customers abiding by terms and conditions often try to hang their hat on the fact that certain things should be spelled out more or more prominently, but there is inadequate support for that kind of additional regulation.