The Start, Stop, Continue Retrospective can be used as often as needed. It is a great way to get feedback from team members on their experiences during a project or iteration. You may find that it works best if you use it at the end of each sprint, after completing a significant milestone in your project, or simply when you feel it could benefit the team. It is also an effective tool for team bonding; allowing everyone to voice their opinions and experiences can help build trust and understanding between teammates. Ultimately, the frequency of use should be determined based on what works best for your team.
However you choose to use it, the Start, Stop, Continue Retrospective provides invaluable insights that can help drive success in future projects and iterations. It can help identify areas for improvement, recognize effective processes that could be used again, or even spark ideas for new ways of working. By actively reflecting on the team's progress and experiences, you will be able to move forward with greater confidence and efficiency.