Once you finish what you’re working on?
Once you sign off for the day?
Once you turn on your out-of-office?
Once you leave your desk?
Once you leave the office?
Once you leave the bar?
Once you’re home?
Once the first day of your official leave begins?
Once you depart for a new destination?
Once you arrive at a new destination?
Once you forget what day it is?
Once you don’t wake up to an alarm?
Once you stop checking emails?
Once your mind stops thinking about work?
And if it’s none of the above, once your leave finishes and you’re back at work, could you say you took a holiday?