It could mean that when working overtime, the same routine or problems keep occurring. For example, you always have to deal with the same difficult client during overtime, or face the same inefficient work processes over and over again.
In the Season 10 finals, Team Excellent Era and Team Happy fought until the end. In the end, Team Happy defeated Team Excellent Era with a score of 3:2, winning the Season 10 championship.
While waiting for the anime, you can also click on the link below to read the classic original work of " Full-time Expert "!
I'm not sure specifically as there could be many '60 minutes overtime' scenarios. It might be about a sports event where there was 60 minutes of overtime play and there are interesting tales behind it like how the players coped, any unexpected events during that time, etc.
Old hat. This phrase implies that something is familiar and has been around for a long time, much like a story that has been told many times before. For example, the plot of some movies can be considered old hat as it follows the same pattern as many others.