Alex lead the group onto the set of her latest movie.
"Hi, guys. My name's Alex, and I'll be your director for the duration of this movie. There's a variety of people involved in this movie - assistant directors, writers, gofers, lead actors, and more."
She paused to let them look around the set. As she began to speak again, her mobile rang. "Hello? ...Yes? ...It's confirmed? Alright, thanks." She hung up.
"Well guys, looks like we've got some bad news." She smiled at the gasps of those who thought the movie might be cancelled. "No, the movie's still going ahead, but it appears there are a few members here who have evil intentions."
Alex surveyed the group. "My assistants haven't been able to locate who these people are, but I've been told some of you have the ability to do so. Instead, I can offer to eliminate one person a day, providing you agree on a majority."
She walked off to her office, leaving the group of 30 to talk amongst themselves.
Day 1 has begun.
(Obviously, I'm not ending this in an hour
Day 1 will be a little over 24 hours.)