how long have you taught

[Verona_82]

Hello,

I've seen the following sentences in grammars:

I've taught at this university for 10 years
I've driven for over 15 years

Assumuing they are good English, is it possible to ask

How long have you taught?
How long have you driven?

My grammar insists on 'have you been teaching" and doesn't give any alternative answers.

Thank you!

 

[5jj]

How long have you taught?
How long have you driven?

My grammar insists on 'have you been teaching" and doesn't give any alternative answers.

I think that the progressive form is more likely, but I don't consider the non-progressive form wrong.