Approximately four years. Construction started in 1968 and the junction was opened in May 1972. There is a short Wikipedia article - see related link.
H.E Francis has written: 'Long-term planning of the London trunk and junction network'
Spaghetti
Spaghetti is a long, thin, cylindrical pasta of Italian origin.The word is derived from "Spaghetti" meaning "thin string" or "twine.
Spaghetti is also a type of pasta. Spaghetti are long, thin and solid. Like other pasta, spaghetti is made of milled wheat & water and sometimes made of vitamins and minerals.
The most common noodle is the spaghetti noodle. The average standard length of an uncooked spaghetti noodle is about 14 inches.
Not the long, string-like spaghetti, but some other types of pasta like shells are hollow.
about a century
Spaghetti? 7 letters??
9-11 inches long
About a week
About three days
about five decades