About 8-10 years, as long as there was little delay with the environmental permits. ......
https://nationalpost.com/news/canada/two-cross-country-pipelines-couldve-diverted-38-4-billion-from-the-u-s-new-study-finds#:~:text=billion per year.-,Energy East%2C a 4%2C500 km pipeline from Alberta to the,%2415 billion at the time.
Damn! Better make that 25.