In my company we are constricted to have 100% of f̶a̶k̶e̶ coverage with unit test.
Obviously the test suites are not performing and it takes more than 8 minutes to run 3335 tests.

I know that what I'm going to say is super mainstream but there is nothing comparable to the relief that comes from seeing all tests in green after you did a lot of small changes around the code on Friday.