The Future of Google's Street View

The city I live in, Berlin has an area of ~821 km^2

Let's suppose that one city block is about 0.2 km x 0.2 km

This implies that there are on the order of 10 km of road per km^2 of area. Thus the length of road is O(10^4) km for one major city. Now if we drive 30 km/h, and there are ~25 intersections per km^2, and the average wait time to turn is 1 minute (I have no idea), then we need 20 + 25 ~ 45 minutes to cover 1 sq km - In reality we will not have a perfectly efficient travelling salesman route and will have to cross some streets more than once so let's say it takes 1 hour per km^2. Thus the entire city can be covered in about 821 hours per car, or about one month / car. If we only allow a 40 hour work week, then it takes about 5 months.

Thus with a modest fleet of 5 cars the city can be updated about once a month. Does this sound right? If so not bad. Of course streetview isn't working here for legal reasons, but this logic should apply to other similar cities.