RE:I have been watching GlobalDiviMan, please correct me if you are a woman (and I don't mean any sexism here :) I have two daughters and they are the best things in my life I've participated in making, lol)
First thing first! It is not healthy to sit for all day, it doesn't help you physical condition and definitely affects clarity of thinking.
Secondly, I don't think the advertising prices are "spot prices". I am almost sure - and I hope our good friend on this forum Mr. RatMan will correct me if I am wrong - that there are at least monthly if not quarterly contracts setting prices, frequencies and time of advertising on the tv screen.
Thus, perhaps schools break, travel disruption, some businesses closing will make the audience bigger that it would be otherwise - but the again.... the number of cable subcribers is probably more important factor than periodic fluctuation of number of people sitting in front of tv for the all day :).
Now, I would like to make clear here that I would like to be wrong in my thinking because the more add the higher Corus' shares go for I have some skin in this game. lol