I've been using the Pomodoro technique for many years. I've always wondered what was "normal" for a typical workday. Google searches resulted in a wide variety of answers, but no clear benchmark.
Although people are very different, we do share the same constraint: time. With a time based approach, I created a spreadsheet based on my schedule. Finally I had an accurate idea of how many Pomodoros were right for me. That spreadsheet evolved into this tool, which I hope others find useful.
In my experience, the daily number of Pomodoros should be more of compass than a ball & chain. Productivity can be heavily affected by your: energy levels, difficulty of the work, as well as your motivation or resistance.