What happens to my time balance during vacation or illness?

Your time balance is the running difference between what you were expected to work and what you actually tracked, so a day with a target time you couldn’t meet would normally pull it down.

Marking a day as vacation, sick leave, or any other special day avoids that: none of these carry a target time of their own, so they simply don’t count against your balance — there’s no separate exception to add on top.