Is this use of "should have been + v-ing" correct?
Is this sentence grammatically correct:

( We shouldn't have been talking about this topic for hours. )

If it is not correct, can you tell me why?

Thanks

Question

Is this use of "should have been + v-ing" correct?
Is this sentence grammatically correct:

( We shouldn't have been talking about this topic for hours. )

If it is not correct, can you tell me why?

Thanks

Answer

It is GRAMMATICALLY correct, but it's not a very good sentence.

It's a little better like this:

"We shouldn't have been talking about this topic for SO MANY hours"

This implies that you have been talking about something for a long time, and are STILL talking about it but you want to end the conversation. If that isn't what you mean, you probably need a different sentence. It's difficult to tell without knowing some context.