Hey BC Construction,
I usually look back to my direct labor hours to determine how many hours it takes me to install a fence. The way I calculate it out is Direct Material Cost + Direct Labor Cost/how many posts I set. The typical fence I install is a 6' tall; 8' treated posts, 7.5' spacing, three rails face nailed or hung, and 6'x6"x1" dog-eared pickets.
An example of my calculation: it takes me, one man, 10-12 hrs to build a fence with 4 posts.
10hrs/4post= 2.5hrs/per post. 2.5 hours per post takes into account all the other time spent installing the rails, pickets, drivetime, and installing the posts. Mind you I did not calculate for rock.
Let's say I am installing a fence that has 50 posts like your fence does.
For one man to complete the job:
50x2.5hrs/post= 125hrs in total for one man to build the whole fence.
Let's say I have three guys building it.
I take my 125hrs/one man/3men= 41.67 hours total to build a 6' fence. Round it up to 42.
If my labor for three guys is $100.00, I take $100.00x42= $4,200 in Labor.
Let me know what you all think of this method!