On my return through Milan from Luzerne, I'm thinking of stopping off and seeing the Last Supper and then jumping back on a train to Turin and see "The Shroud". My question is, for each venue, how long should I allot to: get off the train; check baggage, take local Metro, see the site, and get back to the station for a departing train?
I'll have already seen the sites of Milan, and while I know Turin has other sites to see, I really just have this day to see these two sites and just want to jump off to see them and get back on the trains. Any input would be appreciated.