Going strictly HT to HT using the duckies pumping out 5W, you will get a couple of miles. This assumes a typical "suburban" environment, with lots of houses, and flat terrain.

WIth a decent repeater, you can likely hit it from 10 miles or more. OF course, this assumes that the repeater antenna is quite high up (one hundred feet or more). As with everything, your mileage may very depending upon terrain, buildings, and antennas. But this is my experience.