That's if there are no negotiations at all with regards to media buyouts and exit fees. There's certainly a scenario that can play out, and is not a stretch, where once they have 8 schools to vote for dissolution of the ACC an actual vote takes place to do just that, then it becomes much easier for the schools with landing spots to move to their new homes at much lower costs.
Right now Clemson and FSU will likely have homes in the SEC by 2025. Miami, Notre Dame, and at least one of UNC/UVA have a home in the B1G while the other has potential to get into the SEC as well. That's 6 right there.
All the ACC schools know this. It's no secret to them and all schools are working on finding landing spots. Everyone involved knows this isn't going to 2036. There will be a breaking point when there's at least 8 schools ready to go, then things will get moving very very quickly.
And, again, Duke, NCST, and VT have some shot at getting into one of the major two conferences also(though I don't honestly expect more than 1 to do so), and if they get any sort of invite, even if not full-stake at first, you know they are taking it given the current environment. Even just 1 of them making it takes it to 7.
Schools like BC, GT, Louisville, Syracuse, and Wake all know that the ACC is a dead man walking and the Big 12 is going to be a better bet than staying in the ACC. You just need 1 of them to find a home in the Big 12 and you have 8. I personally think multiple of those schools are going to find a new home, taking it past 8 and closer to 10 or 11 schools in the ACC with landing spots.
I've been wrong plenty in my life, but if I had to make an educated guess, I'd expect movement next year. And even if nobody is announcing their intentions of leaving today, I still would not be surprised at all if in 2025 you have all of these current ACC members playing in their new conferences and not waiting until 2026 at the earliest. Once this ball gets rolling, it is turning into a boulder quickly.