To 22 ports; the busiest crossings are to North Greenwich (1 hour 25 minutes, 61 times a day), Embankment (28 minutes, 54 times a day), London Bridge (46 minutes, 50 times a day), Canary Wharf (an hour, 50 times a day), Greenwich (1 hour 15 minutes, 45 times a day), Bankside (40 minutes, 43 times a day), Tower of London (50 minutes, 43 times a day) and Westminster (18 minutes, 42 times a day).