This depends on the quality of the machine, as well as your maintenance and cleaning habits. If you want to get the most out of your investment, look for good-quality machines made from durable materials such as stainless steel. But for best results, you (or your staff) need to regularly clean your brewer. And you need to engage in routine maintenance such as flushing water lines and descaling the brewer. In some cases, you might need to schedule regular servicing appointments.