Minimum Annual Usage Requirement. Employees shall be required to use a minimum number of hours of PLA each year, in accordance with this table: Years of Required Annual Maximum Annual SERVICE PLA USAGE PLA BALANCE Hire to 5th 40 hours 160 hours 5th to 10th 80 hours 240 hours 10th to 15th 120 hours 320 hours Over 15 160 hours 480 hours