I retired from the operating engineers last December,the border wall could be built in less than a year.
Second to last job I worked on before retiring was 480 miles of dual lay 46" pipeline.
From start to finish, we cleared a 250' wide right of way, laid the pipe,did thousands of road bores,creek crossings and had the job planted in grass seed in 6 months.
People are high on crack if they think we can't do it in less than a year,ALL OF IT!