What is the shortest passenger route served by wide-body aircraft (i.e. B747, B777, A330, A340, A380 etc.), preferably on daily basis, preferably by Lufthansa (but any airline flying from Frankfurt will work for me).
The shortest one, I found, is FRA-IKA (Frankfurt-Teheran) direct flight with less than 5 hours of flying, served by Lufthansa on daily basis with B747.