The Office Assistant Certificate is a 510-hour (17 weeks) Office Assistant Certificate program is an entry-level program. You will learn essential business skills such as business communications, computer essentials, office procedures, business math, word processing, spreadsheet and database software. You may be employed as receptionists, file clerks, and office assistants. You can also choose to continue your education by enrolling in more advanced Office Administration programs such as the Accounting Assistant, Administrative Assistant, Legal Administrative Assistant, or Medical Administrative Assistant Certificate programs.