I have an appointment on [day] only available in office hours and will need to leave by [time].
Running late
Running Late From A bank or official appointment: Telling Your Boss
If a bank or official appointment runs over, a prompt update with a revised time keeps your manager informed and your day workable.
Say what you need, briefly
Banks and offices open only in work hours. Name it as an appointment only available then; you don't need the paperwork detail.
Update your return time clearly
If you're running late back, send a short update as soon as you know, with a revised time and confirmation that nothing urgent is slipping. A prompt, factual update protects trust better than going quiet.
Example messages
I've booked an official appointment first thing on [day] and may be in a little late; I'll make up what I miss.
I need to sort something at the bank that closes before I finish; could I leave by [time] today?
Mistakes to avoid
Don't go quiet and let people wonder. A short, prompt update with a new time is what's needed.
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This page shares wording ideas, not legal or HR advice. Follow your own employer's time-off policy.
Common questions
Do I say what the appointment is?
No. An appointment only in office hours is a complete reason.
When should I send the update?
As soon as you know you'll be late back, with a revised time and cover confirmed.