There are countless war stories about how long a compile can take. Even xkcd made a mention of it.
Now, I haven't been programming for a long time and have mostly just been exposed to Java and Python (and Python is an interpreted language, not a compiled one). I realize it's possible that I just haven't come across projects that take very long to compile, but even for decent sized apps, it has either been instantaneous for me (usually handled in the background by an IDE) or taking no more than 30 seconds or so for an extremely large project. Even in a business environment (where the comic takes place), I've never had code take that long to compile.
Have I just not been exposed to projects with long compile times? Is this a relic of the past that is no longer something that happens in the modern day? Why would a compile take such a long time?