The second fence was begun in late February, according to Politico here.
The 3-meter high 155km barbed barrier is already finished, according to Reuters here.
That's 96 miles in two months for the equivalent of $149 million.
That would come to $3.1 billion for the equivalent of 2,000 miles of US barbed barrier with Mexico. To match the Hungarian pace the US would need to finish the 2,000 miles in 3.5 years.
Somebody tell Trump the election is 2.5 years away.