When to use it
Use it when you need a decision or input from someone busy. Saying how long it will take and what it's for lets them decide right away whether now works, and helps them come prepared. Vague “got a second?” requests are easy to put off.
Example
You: “Do you have 10 minutes today? I need a decision on the launch date.”
Manager: “I'm free at 2. Bring the options.”
In an email or Slack message
In Slack: “Do you have 10 min today? I need a decision on the launch date: the 14th or the 21st. I can also send the details here if that's easier.” Including the options often gets you the answer without a meeting.