One time when I worked to a tight deadline was at university when I was in my final year. I was doing a media production degree and instead of a dissertation I had to make a short documentary film.
The main aspects of making a film are pre-production, in which the project is planned, shooting schedules created and any necessary research carried out, production, where the film is shot on location, and post-production, where the film is edited and and effects added.
Each of these parts are as important as each other, and so it was incredibly important that we did not overrun on any of them. Not sticking to shooting schedules could mean that we would get some great footage, but then have no time to edit it in post.
This process definitely taught me the importance of good timekeeping!