Time depends on size and style of fence. We do most residential jobs in a day. Residential chain link uses mainly anchors. If rock is encountered the use of a jack hammer may need to be introduced into the install.
Time required is extremely variable. What materials will you be using? Chain link, for instance, installs faster than wood. How much space are you enclosing with the fence? Is the terrain flat and unobstructed? Wooded? Rugged? Into what kind of soil will you be placing posts? (Rocks take extra time and effort.) Installing a fence, particularly digging the holes, can be very strenuous work, particularly for a long fence and in rocky soil.
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