If you lived at the Watergate, this is how long your commute would be around the city by car. Good news is that should you be heading to, say, the White House, you can get there in about 10 minutes. (Probably faster under cover of darkness.)
Should you choose instead to travel by public transit, the trip takes slightly longer, but it's easier to blend in with crowds.
These images were generated by Trulia's awkwardly named "Visual analysis of local data" tool, henceforth known as the Commute-o-matic.™ It's less complicated than it seems. The tool looks at known public transit routes (bus stops, train stations) and the travel times between them. What makes it look magical is the speed with which it makes the calculations.
In most cities, you can almost always get more places in less time by car. That revelation won't shock you, though the extent of the problem might. Compare San Jose with San Francisco. Huge difference in what public transit allows.