That kind of search is already available in many portals. You can actually find the shape of a polígon with the places you can reach in 1h of conmuté easily, as

That kind of search is already available in many portals. You can actually find the shape of a polígon with the places you can reach in 1h of conmuté easily, as there is a google maps api for it (distance matrix) and finding the properties in a polygon is a solved problem. (