Running tests is the necessary evil. I have never heard two or more engineers at the water cooler talking about the joys of test execution. Don't get me wrong, tests are great; you should definitely have plenty of them in your project. It is just not a pleasant experience to wait for their execution. If they start to fail, that is even worse. Most probably, someone could become very popular if they could reliably tell which tests will fail before executing them. As for the rest of us, I think we should keep running our tests.
Can We Somehow Reduce the Execution Time at Least?
We can at least try! We could start by understanding the problem more and looking at solutions later.