Unlike pre-compiled footage that can just be made 24 hours long, this was done in real-time with the workers forced to match the demands of the clock without the opportunity to pause during their shifts.
Because of its real-time nature when you view the video synced to your local time you can't help but become somewhat invested in the success of the workers as they struggle to keep up with time and come very close to failing during some transitions. There's tension generated by the fact that you never know whether they'll make the next minute.
Then there's the realisation you get after having watched this for a while that it's really all pointless, that you have become personally invested in the actions of a bunch of workers struggling to keep up with re-creating one of the most basic solved problems of the modern world: A clock. It takes 70 workers working all out to do what a cheap watch can do effortlessly.
I suppose that if it succeeds in getting most viewers to think a bit about the nature of work, time and labour then it achieved its intended purpose.