If you’re buying a batch of speciality coffee you want to get the most out of it. Therefore, buying beans and grinding fresh will give you a cup of coffee with more of its aromatics preserved, the second you grind your beans the coffee begins to oxidise therefore you should always be grinding right before you brew a cup. Coffee loses 60% of its smell in the first 15-30 minutes after milling. Therefore, you’re best to turn on a coffee grinder every day to get the most flavourful and delicious coffee.