I think it will be the entire length.
Trump can put out a call for volunteers—with travel trailers & campers, etc. Help deliver food supplies & potable water. Buy whatever supplies they can as locally as possible, but alot of that border is really remote. You can bring in those Tide trailers for laundry & I would bet that many women would volunteer with their mates to do cooking, etc. This is NOT impossible.
8000 volunteers—paid supervisors—NOT ‘union wages demands’—and GIT ‘ER DONE!!!
I have ridden horseback across some pretty remote parts of the west. Rode the Pony Express Trail in 2001. IT absolute is doable. Might even need pack animals to bring some of the supplies into the worst terrain-—but it CAN be done.
It would be done before we cook a turkey for 2017 Thanksgiving.
“Might even need pack animals “
Big helicopters can carry a lot more than a pack animal.