Could you check this question

Tenacious LearnerHow long has she been vacuuming the floors?
For an hour.

Hello, TL.

Hello Sufer,
Thanks for your help once again.

TL

I like this better:

• How long has she been vacuuming? (It's very redundant to include "the floors" again, especially since that's what you typically vacuum.)
• For the last hour.

For some reason, and I can't explain it, I don't like "for" in this question although it works just fine. I think I might use "for" in this question if I were referring so something somebody had bee

Hi Jessica,
Thanks for your comments!

TL

Hi teachers,
Mary has been vacuuming the floors for the last hour.
Would the following answer be appropriate too?
How long has she been vacuuming (the floors)?
For the last hour.

TL

Tenacious LearnerMary has been vacuuming the floors for the last hour.

Consider this: What was Mary doing all morning? I need her to help me clean the room.
In real life, people don't not neccesarily answer in the same tense as the question.
I really don't see any proble

grammarfreakI really don't see any problem with the phrase " ...for the last hour". I think it is fine.

Hi,
Thanks for your reply.

TL

SurferI would insert for at either the beginning or the end of the question:

There’s no need to; in fact, we usually wouldn’t include for in a question like that at all.