How long does it take the narrator and his neighbor to mend the wall

it takes the narrator and his neighbor a day to mend the wall between their properties. We know this, because the narrator states:

And on a day we meet to walk the line

And set the wall between us once again.

Explanation:

martians or other types of aliens represent a unique fear as opposed to zombies. vampires and other types of monsters.   in most sci-fi stories, aliens come from other worlds and have different or more advanced technology.   abductions and experimentation on human bodies that involve these technologies, or the use of these technologies against human beings and the use of unknown "powers", are a type of fear that's different from that of other types of monsters.  

the writer needs to avoid using abbreviations and check spelling before sharing.