Is it worthwhile going out to see the Appian Way. How long does it take?
It's worth a look, but only if you have seen all of the major sites and minor sites around the center of Rome. Put it on your list but far down on it.
I spent half a day there, but I rented a bike.
We were on the Appian Way in 2004. It was a wonderful experience. No cars, no fumes, no scooters, just a quiet interlude. We ate our lunch at roadside while next to us, in a farm field, sheep ate theirs. You can easily lose track of time and spend hours there. It is not difficult to get to, but as we remember, requires a metro and a bus.