That’s what I tell my neighbors if they want to talk to me while I’m in the middle of a workout.
(I workout in my garage & front of my house.)
Sometimes I’ll point to my stopwatch to emphasize the point.
You can too, even if you didn’t build a garage gym.
You’re on a timer when you’re at the office. You only have until (5?) to get the most important things done.
Some other things, well, they’ll just have to wait.
And it’s perfectly OK to say it.