What about if a person lays in a comma (without conscience) for a month? Would you say that the person sins while his soul is out of his flesh?
So therefore, this task is not impossible.

What about an infant, who can't tell right from wrong? Does it mean that an infant can not go for a month without sinning?

By the way, I personally don't think that there was a time (since I was saved) that I did not sin for a month. Although there might have been a week which passed by, where I did not sin.