Depending on how well your memory memorizes the things you need to know and how good you are with your customers. It takes 2 years of professional experience to become a server. That's how long it takes to learn specific server skills, but it doesn't account for time spent on formal education. Local server training expires three years after the date of publication.
When you finish your training, you will receive a certificate of completion to print as temporary proof of training for your employer.