The walk from Tower Bridge to the Houses of Parliament took me about seventy-five minutes. Yours will be shorter or longer, depending how much time you spend looking at the sights. If, unlike me, you are already familiar with many of the important items I stopped for, you may do it a bit quicker. In any event, a great chance to get close to many famous landmarks. On the negative side, some areas near roadways have foul air, so wear a mask or take a detour if sensitive to diesel exhaust.