As with any manual coffee grinder, the number of clicks on the Hario Mini Mill will vary depending on the grind size you're going for. In general, though, you'll want to click the grinder about 20-30 times for a medium grind, and 40-50 times for a finer grind. If you're grinding for espresso, you'll want to go even finer still, around 60-70 clicks. Experiment and find what works best for your brewing method and taste preferences.