You arrange for a land survey, because you need to know where your boundary is.  You wonder what is taking the surveyor so long, since all he/she has to do is bring out that GPS thing, which shows where your boundary is, right? Nope. It is more complicated than that. 

Boundaries are controlled by things on the ground, such as monuments, stones, iron pipes, etc., which were set by the original surveyor and then adopted by the grantor who split up the land. 

The way boundary law works, is that the original location of these controls the boundary position, even if the monument was not placed in the theoretically exact position which the surveyor intended. There is good reason for this, so that you don't need to keep moving your house, every time it is discovered that there was a more theoretically correct way to have placed the monuments. 

And it takes effort to locate the monuments (stones, brass caps, iron pins, etc.), to weigh them, to look at adjoining properties, etc. 

So, when you hire a surveyor, make your needs known, and listen as the surveyor makes their needs known. Timely provide them documents they ask for. Stay in communication with them. 

By understanding more of what the surveyor needs to accomplish, things can work better for everyone. 

The following video (regular and YouTube versions) is mostly for fun, but it shows how looking for old survey monuments can be like looking for a needle in a haystack.