Tuesday Night, actually! As I summarised in a front page post wrapping up 2013, it was a good addition, aside from the fact that the mature themes were manufactured/forced. It was set around a party, at the same time, on the same day of each week. It didn't cover the entire week's events that were 'too naughty to show at 7pm'.
With that said, though, the fact you were told of the late show on Friday (directors directing the housemates as 'cast-mates'?) is pretty bad as far as the BB format goes. What ever happened to letting housemates be housemates and show/edit around what the housemates create, not a manipulated storyline that just grabs the headlines or gets the social media comments?