From CVG there should be plenty of flights to Chicago or NY and then directs to all those places from there. There’s no need for 2 stop flights. Just filter those out on your search - only look at one stop. A one stop is unlikely to be 24+ hours. A 2 hour flight to NY, let’s be fairly extreme and give you a 6 hour layover, then a 9 hour flight. That’s still well under 24.
If you were going to a place in Europe with no directs from the US then you’d need a 2 stop and the additional layover might make it take that long.
So the one stop filter is important. Looking at random dates, there are plenty of one stops with travel times in the 15 hour range.
If it helps, can you drive to another airport? Dayton, Columbus, or Indianapolis are close. I wouldn’t think they’d be any better but if it saves you 10 hours of layover to drive 2 hours…