UA 520 then UA 545 at San Francisco
Burbank → San Francisco → Austin
Timetable, San Francisco time
11:18UA 520 from Burbank at the gatealso AC 3286
08:40UA 545 to Austin leaves the gatealso AC 5289, VA 8467
21 h 22 apart on the timetable, overnight
UA 545 leaves 21 h 22 after UA 520 arrives on the timetable: more than half a day, so not a connection we count.