Santa Monica Freeway, Los Angeles: this took about 90 seconds to put up and stayed up, amazingly, for over 24 hours.
Highway 101 in Novato: Visible to all lanes, up for four days so far.
Highway 101 in SF: Put this up with the help of
PT Cruiser, down within two hours.
Interstate 10 near National/Overland: Up for three days +.
I-405 North of Venice: Four Days +.
I-80 in Berkeley: Duration Unknown.
USA - 719
FB - 591