5-10 minutes depending on crowds, how many times you go across bridges you aren't supposed to and how many detours you make for photos. It's not long at all and not worth the hassle of trying to repark. The timing of course also depends on which end of each area you're going to. I think it took us 15 minutes, but that's because there were paramedics blocking our way at one point (never did find out what happened), and we fell into the other categories listed above.