To 22 ports; the busiest crossings are to Embankment (22 minutes, 36 times a day), North Greenwich (1 hour 20 minutes, 36 times a day), London Bridge (40 minutes, 33 times a day), Battersea Power Station (4 minutes, 31 times a day), Canary Wharf (56 minutes, 31 times a day), Blackfriars (30 minutes, 29 times a day), Bankside (34 minutes, 26 times a day) and Tower of London (44 minutes, 26 times a day).