OS 401 then QR 3639 at Barcelona
Vienna → Barcelona → Firenze
Timetable, Barcelona time
09:10OS 401 from Vienna at the gatealso LA 5045
07:30QR 3639 to Firenze leaves the gatealso IB 5370, LL 5370, VY 6070
22 h 20 apart on the timetable, overnight
QR 3639 leaves 22 h 20 after OS 401 arrives on the timetable: more than half a day, so not a connection we count.