X3 2139 then DE 4260 at Frankfurt
Fuerteventura → Frankfurt am Main → Milan
Timetable, Frankfurt am Main time
23:05X3 2139 from Fuerteventura at the gate
20:10DE 4260 to Milan leaves the gate
21 h 05 apart on the timetable, overnight
DE 4260 leaves 21 h 05 after X3 2139 arrives on the timetable: more than half a day, so not a connection we count.