Cheryl is a recent college graduate and she is starting her first job. She wants to participate in her companies' 401(k) plan as soon as she becomes eligible. The target amount of money she would like to save is $1 million. Assume her annual salary of $50,000 remains constant throughout her tenure as an employee and she can contribute 5% annually. The current interest rate is 4.5%. How many years must she work to reach her goal?