The president ...... (talk) to his advisors for over two hours now. I wonder when they're going to finish.

The plane ...... (fly) at this altitude for nearly six hours. That means we're halfway in Mexico already.

The mine workers ...... (go) down to the coal mine for decades now and none of them ever got hurt.

The teacher ...... (explain) the Present Perfect Continuous for hours now and the students still don't understand the usage.

Mrs Conrad ...... (sit) in that chair for over three hours now without making a single move. Do you think she's all right?

The tourists ...... (cycle) all day long so I suppose they must be worn out now.

Jane ...... (jog) in the park just opposite my place for years. She seems to like the place very much.

The DJ ...... (play) great songs all night. How about staying a little longer then?

The surgeons ...... (operate) on the patient since 6.00 this morning.

Sweet Lilly ...... (smile) really charmingly ever since I met her.

Ms Jankins ...... (clean) the windows for over two hours now.

The wind ...... (blow) for hours on end now.