As a mid-aged native English speaker, the intent of your dialog was clear to me and I understood the reference to the verb “not giving an inch”.

Do you think you merely haven’t changed your mind?
How many inches is not considered an inch?

Can you shorten the response time to

“Not an inch”?

I find this somewhat informal in tone. Do you think having the same conversation would be better since you are not likely to change your mind?

How do I do this?
No.
Not a bit.

What are some basic facts and figures regarding the nature of a human life?

As a mid-aged native English speaker, the intent of your dialog was clear to me and I understood the reference to the verb “not giving an inch”.

Do you think you merely haven’t changed your mind?
How many inches is not considered an inch?

Can you shorten the response time to

“Not an inch”?

I find this somewhat informal in tone. Do you think having the same conversation would be better since you are not likely to change your mind?

How do I do this?
No.
Not a bit.

What are some basic facts and figures regarding the nature of a human life?