I can think of one hypothetical sentence where "suburban-lengthed" might refer to the physical properties of the suburbs, and not to the size of the Chevrolet Suburban:

"It's difficult to be without a car in a typical American suburb, especially when one considers the suburban-lengthed distances between a residential-zoned street and the nearest commercial district with a shopping center."

The meaning here is that (stereo)typical American suburbs are very spread out physically, and not very "pedestrian friendly," because everything is far apart. Also, in the suburbs, residential streets are often deliberately separated from commercial streets as a noise-reduction measure. Thus, if you live in the suburbs, the nearest grocery store might be 20-25 minutes away пешком. (But in an urban neighborhood such as Brooklyn, NY, it might take you less than five minutes to walk to the grocery store -- everything is closer together.)

P.S. I speak from personal experience, as someone who formerly lived in Brooklyn, but who now lives in the "stereotypical American suburb" of Fairfax!