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All of them have been interpreted languages like PHP, Python and Ruby. Their builds and tests took between 30-45 minutes. As far as project size and complexity, these were projects that were built and maintained by four person teams over the course of 3-5 years, so it's not like they were massive services with hundreds of developers.
I'm still kind of new, I worked at a couple internships and I've been working full time for a year so I might be totally wrong but I feel like these CI pipelines could be optimized to run faster.