To 23 ports; the busiest crossings are to Westminster (50 minutes, 72 times a day in season), Tower of London (25 minutes, 52 times a day), Bankside (34 minutes, 53 times a day in season), North Greenwich (8 minutes, 45 times a day), Canary Wharf (14 minutes, 42 times a day), Battersea Power Station (1 hour 5 minutes, 42 times a day), London Bridge (30 minutes, 40 times a day) and Embankment (46 minutes, 40 times a day).