BJ 246 then UA 59 at Frankfurt
Tunis → Frankfurt am Main → San Francisco
Timetable, Frankfurt am Main time
17:05BJ 246 from Tunis at the gate
13:30UA 59 to San Francisco leaves the gate
20 h 25 apart on the timetable, overnight
UA 59 leaves 20 h 25 after BJ 246 arrives on the timetable: more than half a day, so not a connection we count.