Some examples and use cases from the internet:

Some examples and use cases from the internet:

• How long have you been waiting?
• How long have you been waiting?
• How long have you been waiting to say something?
• Have you been waiting long, sir?
• Sorry, have you been waiting long?
• How long have you been waiting for?
• Have you been waiting here all weekend?
• And how long have you been waiting for Marie?

• It doesn't look like this phrase is very popular! The search could not find any examples on the internet.