Most people team up. I usually spend my time exploring new technologies and new paradigms to help simplify our stack. I've been doing it for a few years, and

Most people team up. I usually spend my time exploring new technologies and new paradigms to help simplify our stack. I've been doing it for a few years, and many of our foundational services and technologies came directly out of these free weeks. A lot of people take it as an opportunity to solve annoying problems that we don't have time to solve "on sprint". Definitely helped my career, because I can focus on building skills that I personally want to develop, in addition to building something ambitious without worrying about failure.