Adopting DevOps practices, such as continuous integration/continuous delivery, can greatly reduce the amount of time you have to spend on building and testing your applications. Besides building your applications, there are also many other concerns that you can address in your pipelines.
When you start adding more and more tasks to your pipelines, you might run into a situation in which a single execution of your pipeline starts taking too long, sometimes longer than 5 minutes. Note that this a general recommendation for the maximum duration of a CI pipeline. In order to battle this, you might be interested in splitting your solution up into smaller builds and maybe even repositories. To do this, you could build parts of that application in isolation and then use the results of these builds in your main application as ready-built components.