You can't really say that the breakeven point is X number of days, as it depends more on the number of trips and the length of each trip.
For example, the DVC Gold pass is $699 (all prices excluding taxes). A 10 day park hopper (the equivalent ticket to an AP) is $588 (May 9, 2020 start date), and a 1 day ticket for the day time is $195. So in this case, 11 days of tickets is more expensive than the Gold AP. BUT - a 3day Park Hopper during Christmas week is $506 and a 1day hopper in May is $195 for a total of $701 for a total of 4 days.
So as you can see, you can't really say that breakeven is X days. You can say 2 trips provided each of those trips is 3 or more days long.
Steve