時間・時点N1
〜ところを
at the time of... / while... (used in polite requests/thanks)
Structure
V-ているところ + を
Explanation
V-ているところ + を: at the time of..., used in set phrases like お忙しいところを before thanks or requests.
Examples
お忙しいところを、ご対応いただきありがとうございます。
Thank you for handling this despite how busy you are.
お休みのところを、申し訳ございません。
I apologize for disturbing you during your rest.
Note
Often in set phrases お忙しいところを/お休みのところを, followed by thanks or apology. Compare the N2 ところを (interrupted) usage.