Knowing how many hours you work will help you determine your annual revenue from a financial standpoint. If you work an hourly job, you can figure out your take-home pay for the year by knowing how many hours you’ll be able to work in a given year. For anybody planning to budget for big purchases like a home or a car, this is of utmost importance. This does not, however, only apply to hourly workers. Salary workers frequently put in longer hours than the standard 40 per week.