Metro Rapid Lines 720, 770 and 780 are the only lines that complement multiple lines (the 720 runs alongside the 18 and 20; 770 runs alongside 68 and 70; and the 780 runs alongside the 180, 181 and 217); Lines 720 and 780 are the longest routes in the Metro Rapid system. They take roughly 2 hours from start to end during rush hours. Also, line 720 is the most frequent of all Rapids. In the morning rush hour, the Rapid 720 ranges from every 2–10 minutes.