noun
during working hours; on company time
Refers to the period when one is officially at work; often used in rules or descriptions of work-related activities.
就業時間中は私用の電話を控えてください。
Please refrain from personal calls during working hours.
就業時間中に社外に出る場合は、許可が必要です。
You need permission to leave the office during working hours.
Similar meaning, but 勤務時間中 is more common in some contexts; 就業時間中 is slightly more formal and often used in company regulations.
Compound of 就業 (work, employment), 時間 (time, hours), and 中 (during).