Okay, 6 hours is a little long, BUT it’s totally worth it because you not only get to visit almost every landmark in San Francisco, but you get to do it on an electric bike. You can literally not pedal at all up the hills if you want. Super cool. Josh, our tour guide, was mellow, conscientious, and knowledgeable about both the city and the bikes. I never felt unsafe despite the times we were riding in city traffic. We had a great time!