Select the edge
Activate Move + Ctrl
Pick a start point
Move the edge in the desired direction
Type the distance desired + <enter> [say 6]
The copy of the edge is made moved 6 units in that direction
Immediately typing another distance changes the moved amount
Next immediately type the number of copies you want, followed by x and <enter>
So for 10 copies that'd be 10x
The moved edge is replicated 10 times in the direction you chose, beyond the first copy, using the same distance each time...
To copy a number of edges between the original and the first copy's position use /10 instead... then the space between the original edge and the first copy is subdivided with new duplicates, evenly spaced to fit in...