My colleague is in a senior position to me. In our office we don't have a clock in/out system and we have no onsite management.
Part of her job is to fill in a timesheet on behalf of everybody in the department.
Over the last year or so she has never worked a full week and marks on the calendar that she has a couple of hours holiday leave to take maybe twice- three times a week. I was suspicious for a while because although she doesn't take full weeks off, it seemed like she had a lot more leave than anyone else.
Her leaving early means a lot more work for me as we get busier towards the end of the day and if she took a full day off, someone would cover her role but not if its just a couple of hours.
Last week when she left early I checked the timesheets and she hasn't declared any of these hours. She has almost four weeks of leave left and we have been offered payment for any days left at the end of the year (April- April) so I'm assuming she's going to cash it in.
Our manager has no way of knowing she's doing this unless someone explicitly tells her.
YABU- she might have a reason she needs to leave early so much/she might need the holidays and the extra money.
YANBU- she is abusing the system and making work life more difficult for the people who have to pick up her slack.