How should you invest your time during your working hours?

Time management is a big topic in the world of business. If you aren't capable of organizing your time properly, setting up priorities and focusing on important tasks, you can never work efficiently. It's often the case that employees feel overwhelmed with trivial and routine tasks to such an extent that they don't find the time to work on larger projects, and they miss deadlines. What is the best way to invest your time during your working hours if you work in the sales sector?