3-6 months of contracting lead time. Bidding doesn't start until the money is received/certified, after award there is a month or two to start work.
Troops are currently deployed emplacing concertina, among other border functions. Their mission has been extended through the end of the Fiscal Year, during which time they are expected to emplace a few hundred miles of concertina.
Nogales, AZ:
76,000 illegal aliens invaded out country last month. 100,000 are coming this month. What do you propose to stop that cold now?