One can learn a lot about an employee or coworker by spending time with the person on his or her .....-time. (*) on (*) full (*) part (*) off
This is a companion discussion topic for the original entry at https://english.best/questions/22383,one-can-learn-a-lot-about-an-employee-or-coworker-by-spending-time-with-the-person-on-his-or-her-___-time/