The phrase "when to work" can relate to setting or expressing work time preferences and scheduling availability. According to employee scheduling software like WhenToWork, employees and managers can set work time preferences that indicate the times an employee prefers to work or cannot work. These preferences help optimize scheduling by prioritizing shifts for employees who prefer to work at those times. To set these preferences:

• Employees or managers indicate repetitive weekly preferences, specifying when an employee prefers to work each day.
• Date-specific preferences can then override the weekly repeating preferences for special occasions or different availability on certain days.
• Employees can paint or highlight their preferred working times down to 15-minute intervals.
• Once preferences are saved, scheduling tools can use them to assign shifts more efficiently and accommodate availability.

In short, "when to work" involves defining preferred and available work times to facilitate better scheduling and workforce management.