OO 225 then UA 543 at O'Hare
Richmond → Chicago → San Francisco
Timetable, Chicago time
11:48OO 225 from Richmond at the gate
10:25UA 543 to San Francisco leaves the gate
22 h 37 apart on the timetable, overnight
UA 543 leaves 22 h 37 after OO 225 arrives on the timetable: more than half a day, so not a connection we count.